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Deep C (and C++)                                     by Olve Maudal and Jon Jagger                                        ...
Suppose you are about to interview a candidate for a position asC programmer for various embedded platforms. As part of th...
Suppose you are about to interview a candidate for a position asC programmer for various embedded platforms. As part of th...
Suppose you are about to interview a candidate for a position asC programmer for various embedded platforms. As part of th...
What will happen if you try to compile, link and run this program?                     int main()                     {   ...
What will happen if you try to compile, link and run this program?                     int main()                     {   ...
What will happen if you try to compile, link and run this program?                     int main()                     {   ...
What will happen if you try to compile, link and run this program?                     int main()                     {   ...
What will happen if you try to compile, link and run this program?                     int main()                     {   ...
What will happen if you try to compile, link and run this program?                     int main()                     {   ...
What will happen if you try to compile, link and run this program?                     int main()                     {   ...
What will happen if you try to compile, link and run this program?                     int main()                     {   ...
What will happen if you try to compile, link and run this program?                     int main()                     {   ...
What will happen if you try to compile, link and run this program?                     int main()                     {   ...
What will happen if you try to compile, link and run this program?                     int main()                     {   ...
What will happen if you try to compile, link and run this program?                     int main()                     {   ...
What will happen if you try to compile, link and run this program?                     int main()                     {   ...
What will happen if you try to compile, link and run this program?                     int main()                     {   ...
What will happen if you try to compile, link and run this program?                     int main()                     {   ...
What will happen if you try to compile, link and run this program?                     int main()                     {   ...
What will happen if you try to compile, link and run this program?                     int main()                     {   ...
What will happen if you try to compile, link and run this program?                     int main()                     {   ...
What will happen if you try to compile, link and run this program?                     int main()                     {   ...
What will happen if you try to compile, link and run this program?                     int main(void)                     ...
What will happen if you try to compile, link and run this program?                      int main(void)                    ...
What will happen if you try to compile, link and run this program?                     int main(void)                     ...
What will happen if you try to compile, link and run this program?                     int main(void)                     ...
What will happen if you try to compile, link and run this program?                     int main(void)                     ...
What will happen if you try to compile, link and run this program?                     int main(void)                     ...
What will happen if you try to compile, link and run this program?                     int main(void)                     ...
What will happen if you try to compile, link and run this program?                     #include <stdio.h>                 ...
What will happen if you try to compile, link and run this program?                     #include <stdio.h>                 ...
What will happen if you try to compile, link and run this program?                     #include <stdio.h>                 ...
What will happen if you try to compile, link and run this program?                     #include <stdio.h>                 ...
What will happen if you try to compile, link and run this program?                     #include <stdio.h>                 ...
What will happen if you try to compile, link and run this program?                     #include <stdio.h>                 ...
What will happen if you try to compile, link and run this program?                     #include <stdio.h>                 ...
What will happen if you try to compile, link and run this program?                     #include <stdio.h>                 ...
What will happen if you try to compile, link and run this program?                     #include <stdio.h>                 ...
What will happen if you try to compile, link and run this program?                     #include <stdio.h>                 ...
What will happen if you try to compile, link and run this program?                     #include <stdio.h>                 ...
What will happen if you try to compile, link and run this program?                     #include <stdio.h>                 ...
What will happen if you try to compile, link and run this program?                     #include <stdio.h>                 ...
What will happen if you try to compile, link and run this program?                     #include <stdio.h>                 ...
What will happen if you try to compile, link and run this program?                     #include <stdio.h>                 ...
Is there any difference between these two candidates?
Is there any difference between these two candidates? Not much, yet, but I really like her answers so far.
Now suppose they are not really candidates. Perhaps theyare stereotypes for engineers working in your organization?
Now suppose they are not really candidates. Perhaps theyare stereotypes for engineers working in your organization?
Now suppose they are not really candidates. Perhaps they   are stereotypes for engineers working in your organization?Woul...
Let’s find out how deep their knowledge of C and C++ is...
Let’s find out how deep their knowledge of C and C++ is...
#include <stdio.h>void foo(void){    int a = 3;    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    foo();}
#include <stdio.h>       it will print 4, then 4, then 4void foo(void){    int a = 3;    ++a;    printf("%dn", a);}int mai...
#include <stdio.h>void foo(void){    int a = 3;    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    foo();}
#include <stdio.h>void foo(void){    static int a = 3;    ++a;    printf("%dn", a);}int main(void){    foo();    foo();   ...
#include <stdio.h>       it will print 4, then 5, then 6void foo(void){    static int a = 3;    ++a;    printf("%dn", a);}...
#include <stdio.h>void foo(void){    static int a = 3;    ++a;    printf("%dn", a);}int main(void){    foo();    foo();   ...
#include <stdio.h>void foo(void){    static int a;    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    foo...
#include <stdio.h>void foo(void){    static int a;    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    foo...
#include <stdio.h>void foo(void){    static int a;    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    foo...
#include <stdio.h>       eh, is it undefined? do you get garbage values?void foo(void){    static int a;    ++a;    printf(...
#include <stdio.h>       eh, is it undefined? do you get garbage values?void foo(void)                                     ...
#include <stdio.h>       eh, is it undefined? do you get garbage values?void foo(void)                                     ...
#include <stdio.h>       eh, is it undefined? do you get garbage values?void foo(void)                                     ...
#include <stdio.h>       eh, is it undefined? do you get garbage values?void foo(void)                                     ...
#include <stdio.h>       eh, is it undefined? do you get garbage values?void foo(void)                                     ...
#include <stdio.h>void foo(void){    static int a;    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    foo...
#include <stdio.h>void foo(void){    int a;    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    foo();}
#include <stdio.h>void foo(void){    int a;    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    foo();}
#include <stdio.h>void foo(void){    int a;    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    foo();}
Now you get 1, then 1, then 1#include <stdio.h>void foo(void){    int a;    ++a;    printf("%dn", a);}int main(void){    f...
Now you get 1, then 1, then 1#include <stdio.h>                         Ehm, why do you think that will happen?void foo(vo...
Now you get 1, then 1, then 1#include <stdio.h>                            Ehm, why do you think that will happen?void foo...
Now you get 1, then 1, then 1#include <stdio.h>                            Ehm, why do you think that will happen?void foo...
Now you get 1, then 1, then 1#include <stdio.h>                            Ehm, why do you think that will happen?void foo...
Now you get 1, then 1, then 1#include <stdio.h>                            Ehm, why do you think that will happen?void foo...
Now you get 1, then 1, then 1#include <stdio.h>                                Ehm, why do you think that will happen?void...
Now you get 1, then 1, then 1#include <stdio.h>                                Ehm, why do you think that will happen?void...
Now you get 1, then 1, then 1#include <stdio.h>                                Ehm, why do you think that will happen?void...
#include <stdio.h>void foo(void){    int a;    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    foo();}
#include <stdio.h>       Why do you think static variables are set to 0,                         while auto variables are ...
#include <stdio.h>       Why do you think static variables are set to 0,                         while auto variables are ...
#include <stdio.h>       Why do you think static variables are set to 0,                         while auto variables are ...
#include <stdio.h>       Why do you think static variables are set to 0,                         while auto variables are ...
#include <stdio.h>       Why do you think static variables are set to 0,                         while auto variables are ...
#include <stdio.h>       Why do you think static variables are set to 0,                         while auto variables are ...
#include <stdio.h>        Why do you think static variables are set to 0,                          while auto variables ar...
#include <stdio.h>void foo(void){    int a;    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    foo();}
#include <stdio.h>void foo(void){    int a;    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    foo();}
#include <stdio.h>void foo(void){    int a;    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    foo();}
#include <stdio.h>static int a;void foo(void){    int a;    ++a;    printf("%dn", a);}int main(void){    foo();    foo(); ...
#include <stdio.h>static int a;void foo(void){    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    foo();}
#include <stdio.h>static int a;void foo(void){    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    foo();}
#include <stdio.h>static int a;void foo(void){    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    foo();}
#include <stdio.h>static int a;void foo(void){    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    foo();}
1, 2, 3#include <stdio.h>static int a;void foo(void){    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    ...
1, 2, 3#include <stdio.h>                           ok, why?static int a;void foo(void){    ++a;    printf("%dn", a);}int ...
1, 2, 3#include <stdio.h>                                               ok, why?static int a;                         beca...
1, 2, 3#include <stdio.h>                                               ok, why?static int a;                         beca...
1, 2, 3#include <stdio.h>                                               ok, why?static int a;                         beca...
#include <stdio.h>static int a;void foo(void){    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    foo();}
#include <stdio.h>int a;void foo(void){    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    foo();}
#include <stdio.h>int a;void foo(void){    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    foo();}
#include <stdio.h>int a;void foo(void){    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    foo();}
garbage, garbage, garbage#include <stdio.h>int a;void foo(void){    ++a;    printf("%dn", a);}int main(void){    foo();   ...
garbage, garbage, garbage#include <stdio.h>                             why do you think that?int a;void foo(void){    ++a...
garbage, garbage, garbage#include <stdio.h>                              why do you think that?int a;                     ...
garbage, garbage, garbage#include <stdio.h>                              why do you think that?int a;                     ...
garbage, garbage, garbage#include <stdio.h>                              why do you think that?int a;                     ...
garbage, garbage, garbage#include <stdio.h>                              why do you think that?int a;                     ...
garbage, garbage, garbage#include <stdio.h>                                           why do you think that?int a;        ...
garbage, garbage, garbage#include <stdio.h>                                               why do you think that?int a;    ...
garbage, garbage, garbage#include <stdio.h>                                               why do you think that?int a;    ...
#include <stdio.h>int a;void foo(void){    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    foo();}
#include <stdio.h>int a;void foo(void){    ++a;    printf("%dn", a);}int main(void){    foo();    foo();    foo();}
it will print 1, 2, 3, the variable is still statically#include <stdio.h>                allocated and it will be set to 0...
it will print 1, 2, 3, the variable is still statically#include <stdio.h>                allocated and it will be set to 0...
it will print 1, 2, 3, the variable is still statically#include <stdio.h>                         allocated and it will be...
I am now going to show you something cool!
I am now going to show you something cool!#include <stdio.h>void foo(void){    int a;    printf("%dn", a);}void bar(void){...
I am now going to show you something cool!#include <stdio.h>                $ cc foo.c && ./a.outvoid foo(void){    int a;...
I am now going to show you something cool!#include <stdio.h>                $ cc foo.c && ./a.out                         ...
I am now going to show you something cool!#include <stdio.h>                $ cc foo.c && ./a.out                         ...
I am now going to show you something cool!#include <stdio.h>                $ cc foo.c && ./a.out                         ...
I am now going to show you something cool!#include <stdio.h>                $ cc foo.c && ./a.out                         ...
I am now going to show you something cool!#include <stdio.h>                $ cc foo.c && ./a.out                         ...
I am now going to show you something cool!#include <stdio.h>                $ cc foo.c && ./a.out                         ...
I am now going to show you something cool!#include <stdio.h>                $ cc foo.c && ./a.out                         ...
I am now going to show you something cool!#include <stdio.h>                $ cc foo.c && ./a.out                         ...
I am now going to show you something cool!#include <stdio.h>                $ cc foo.c && ./a.out                         ...
I am now going to show you something cool!#include <stdio.h>                $ cc foo.c && ./a.out                         ...
I am now going to show you something cool!#include <stdio.h>                $ cc foo.c && ./a.out                         ...
I am now going to show you something cool!#include <stdio.h>                 $ cc foo.c && ./a.out                        ...
#include <stdio.h>       $ cc -O foo.c && ./a.out                         1606415608void foo(void){    int a;    printf("%...
#include <stdio.h>       $ cc -O foo.c && ./a.out                         1606415608void foo(void){    int a;    printf("%...
#include <stdio.h>       $ cc -O foo.c && ./a.out                         1606415608void foo(void){    int a;             ...
So what about this code snippet?
So what about this code snippet?#include <stdio.h>void foo(void){    int a = 41;    a = a++;    printf("%dn", a);}int main...
#include <stdio.h>void foo(void){    int a = 41;    a = a++;    printf("%dn", a);}int main(void){    foo();}
#include <stdio.h>       I would never write code like that.void foo(void){    int a = 41;    a = a++;    printf("%dn", a)...
#include <stdio.h>       I would never write code like that.void foo(void)                                      That’s nic...
#include <stdio.h>       I would never write code like that.void foo(void)                                      That’s nic...
#include <stdio.h>       I would never write code like that.void foo(void)                                      That’s nic...
#include <stdio.h>       I would never write code like that.void foo(void)                                      That’s nic...
#include <stdio.h>       I would never write code like that.void foo(void)                                      That’s nic...
#include <stdio.h>       I would never write code like that.void foo(void)                                      That’s nic...
#include <stdio.h>       I would never write code like that.void foo(void)                                      That’s nic...
#include <stdio.h>                 I would never write code like that.void foo(void)                                      ...
#include <stdio.h>void foo(void){    int a = 41;    a = a++;    printf("%dn", a);}int main(void){    foo();}
#include <stdio.h>void foo(void){    int a = 41;    a = a++;    printf("%dn", a);}int main(void){    foo();}
#include <stdio.h>       a gets an undefined valuevoid foo(void){    int a = 41;    a = a++;    printf("%dn", a);}int main(...
#include <stdio.h>        a gets an undefined valuevoid foo(void)                         I don’t get a warning when compil...
#include <stdio.h>          a gets an undefined valuevoid foo(void)                           I don’t get a warning when co...
#include <stdio.h>                  a gets an undefined valuevoid foo(void)                                  I don’t get a ...
#include <stdio.h>                                      a gets an undefined valuevoid foo(void)                            ...
So what about this code snippet?
So what about this code snippet?#include <stdio.h>int b(void) { puts(“3”); return 3; }int c(void) { puts(“4”); return 4; }...
#include <stdio.h>int b(void) { puts(“3”); return 3; }int c(void) { puts(“4”); return 4; }int main(void){    int a = b() +...
#include <stdio.h>     int b(void) { puts(“3”); return 3; }     int c(void) { puts(“4”); return 4; }     int main(void)   ...
#include <stdio.h>     int b(void) { puts(“3”); return 3; }     int c(void) { puts(“4”); return 4; }     int main(void)   ...
#include <stdio.h>     int b(void) { puts(“3”); return 3; }     int c(void) { puts(“4”); return 4; }     int main(void)   ...
#include <stdio.h>     int b(void) { puts(“3”); return 3; }     int c(void) { puts(“4”); return 4; }     int main(void)   ...
#include <stdio.h>     int b(void) { puts(“3”); return 3; }     int c(void) { puts(“4”); return 4; }     int main(void)   ...
#include <stdio.h>     int b(void) { puts(“3”); return 3; }     int c(void) { puts(“4”); return 4; }     int main(void)   ...
#include <stdio.h>int b(void) { puts(“3”); return 3; }int c(void) { puts(“4”); return 4; }int main(void){    int a = b() +...
#include <stdio.h>int b(void) { puts(“3”); return 3; }int c(void) { puts(“4”); return 4; }int main(void){    int a = b() +...
#include <stdio.h>      int b(void) { puts(“3”); return 3; }      int c(void) { puts(“4”); return 4; }      int main(void)...
#include <stdio.h>      int b(void) { puts(“3”); return 3; }      int c(void) { puts(“4”); return 4; }      int main(void)...
At this point I think he has just revealed a shallowunderstanding of C programming, while she hasexcelled in her answers s...
So what is it that she seems to understand better than most?
So what is it that she seems to understand better than most?               • Declaration and Definition
So what is it that she seems to understand better than most?               • Declaration and Definition               • Cal...
So what is it that she seems to understand better than most?               • Declaration and Definition               • Cal...
So what is it that she seems to understand better than most?               • Declaration and Definition               • Cal...
So what is it that she seems to understand better than most?               • Declaration and Definition               • Cal...
So what is it that she seems to understand better than most?               • Declaration and Definition               • Cal...
We’d like to share some things about:      Sequence points      Different C standards
What do these code snippets print?
What do these code snippets print?1   int a=41; a++; printf("%dn", a);
What do these code snippets print?1   int a=41; a++; printf("%dn", a);2   int a=41; a++ & printf("%dn", a);
What do these code snippets print?1   int a=41; a++; printf("%dn", a);2   int a=41; a++ & printf("%dn", a);3   int a=41; a...
What do these code snippets print?1   int a=41; a++; printf("%dn", a);2   int a=41; a++ & printf("%dn", a);3   int a=41; a...
What do these code snippets print?1   int a=41; a++; printf("%dn", a);2   int a=41; a++ & printf("%dn", a);3   int a=41; a...
What do these code snippets print?1   int a=41; a++; printf("%dn", a);            422   int a=41; a++ & printf("%dn", a);3...
What do these code snippets print?1   int a=41; a++; printf("%dn", a);            422   int a=41; a++ & printf("%dn", a); ...
What do these code snippets print?1   int a=41; a++; printf("%dn", a);            422   int a=41; a++ & printf("%dn", a); ...
What do these code snippets print?1   int a=41; a++; printf("%dn", a);            422   int a=41; a++ & printf("%dn", a); ...
What do these code snippets print?1   int a=41; a++; printf("%dn", a);            422   int a=41; a++ & printf("%dn", a); ...
What do these code snippets print?1    int a=41; a++; printf("%dn", a);            42 2   int a=41; a++ & printf("%dn", a)...
Sequence PointsA sequence point is a point in the programsexecution sequence where all previous side-effects shall have ta...
Sequence Points - Rule 1Between the previous and next sequence point anobject shall have its stored value modified at most...
Sequence Points - Rule 2Furthermore, the prior value shall be read only todetermine the value to be stored. (6.5)         ...
Sequence PointsA lot of developers think C has many sequence points
Sequence PointsThe reality is that C has very few sequence points.This helps to maximize optimization opportunitiesfor the...
/* K&R C */                         // C++ (C++98)void say_it(a, s)                   #include <cstdio>     int a;     cha...
Let’s get back to our two developers...
So what about this code snippet?
So what about this code snippet?#include <stdio.h>struct X { int a; char b; int c; };int main(void){    printf("%dn", size...
#include <stdio.h>struct X { int a; char b; int c; };int main(void){    printf("%dn", sizeof(int));    printf("%dn", sizeo...
#include <stdio.h>struct X { int a; char b; int c; };int main(void){    printf("%dn", sizeof(int));    printf("%dn", sizeo...
#include <stdio.h>struct X { int a; char b; int c; };int main(void){    printf("%dn", sizeof(int));    printf("%dn", sizeo...
#include <stdio.h>struct X { int a; char b; int c; };int main(void){    printf("%dn", sizeof(int));    printf("%dn", sizeo...
#include <stdio.h>struct X { int a; char b; int c; };int main(void){    printf("%dn", sizeof(int));    printf("%dn", sizeo...
#include <stdio.h>struct X { int a; char b; int c; };int main(void){    printf("%dn", sizeof(int));    printf("%dn", sizeo...
#include <stdio.h>struct X { int a; char b; int c; };int main(void){    printf("%dn", sizeof(int));    printf("%dn", sizeo...
#include <stdio.h>struct X { int a; char b; int c; };int main(void){    printf("%dn", sizeof(int));    printf("%dn", sizeo...
#include <stdio.h>      struct X { int a; char b; int c; };      int main(void)      {          printf("%dn", sizeof(int))...
#include <stdio.h>      struct X { int a; char b; int c; };      int main(void)      {          printf("%dn", sizeof(int))...
#include <stdio.h>      struct X { int a; char b; int c; };      int main(void)      {          printf("%dn", sizeof(int))...
#include <stdio.h>       struct X { int a; char b; int c; };       int main(void)       {           printf("%dn", sizeof(i...
#include <stdio.h>struct X { int a; char b; int c; };int main(void){    printf("%dn", sizeof(int));    printf("%dn", sizeo...
#include <stdio.h>struct X { int a; char b; int c; };int main(void){    printf("%zun", sizeof(int));    printf("%zun", siz...
#include <stdio.h>      struct X { int a; char b; int c; };      int main(void)      {          printf("%zun", sizeof(int)...
#include <stdio.h>      struct X { int a; char b; int c; };      int main(void)      {          printf("%zun", sizeof(int)...
#include <stdio.h>      struct X { int a; char b; int c; };      int main(void)      {          printf("%zun", sizeof(int)...
#include <stdio.h>      struct X { int a; char b; int c; };      int main(void)      {          printf("%zun", sizeof(int)...
#include <stdio.h>struct X { int a; char b; int c; };int main(void){    printf("%zun", sizeof(int));    printf("%zun", siz...
#include <stdio.h>struct X { int a; char b; int c; };int main(void){    printf("%zun", sizeof(int));    printf("%zun", siz...
#include <stdio.h>      struct X { int a; char b; int c; };      int main(void)      {          printf("%zun", sizeof(int)...
#include <stdio.h>      struct X { int a; char b; int c; };      int main(void)      {          printf("%zun", sizeof(int)...
#include <stdio.h>                   struct X { int a; char b; int c; };                   int main(void)                 ...
#include <stdio.h>struct X { int a; char b; int c; };int main(void){    printf("%zun", sizeof(int));    printf("%zun", siz...
#include <stdio.h>struct X { int a; char b; int c; };int main(void){    printf("%zun", sizeof(int));    printf("%zun", siz...
#include <stdio.h>    struct X { int a; char b; int c; };    int main(void)    {        printf("%zun", sizeof(int));      ...
#include <stdio.h>    struct X { int a; char b; int c; };    int main(void)    {        printf("%zun", sizeof(int));      ...
#include <stdio.h>    struct X { int a; char b; int c; };    int main(void)    {        printf("%zun", sizeof(int));      ...
#include <stdio.h>struct X { int a; char b; int c; };int main(void){    printf("%zun", sizeof(int));    printf("%zun", siz...
#include <stdio.h>struct X { int a; char b; int c; };int main(void){    printf("%zun", sizeof(int));    printf("%zun", siz...
#include <stdio.h>    struct X { int a; char b; int c; };    int main(void)    {        printf("%zun", sizeof(int));      ...
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What will happen if you Deep C

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What will happen if you try to compile, link and run this program? #include <stdio.h> int main(void) { int a = 42; printf(“%dn”, a); }and here is what I get when compiling, linking and running theabove program on my machine: $ cc -std=c89 -c foo.c $ cc foo.o

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