2. 1.

Preprocessing Directive
#include <stdio.h>
stdio.h
preprocessing directives

3. 
2
- #include <
>
include)
- #include “
”

4. 2.

main( )
main “
”
{
}
{
} main( )
void main(void)
main()

6. 3.

comment)
source code
2
•

10. Run >
Run < Ctrl + F9> )
LampangKanlayanee School
printf( )
String)
;)
stdio ( standard
input output)
#include directive) stdio.h
header file)

11. 
: printf()
printf()
intprintf (<control>, <argument list>);

12. printf()
(Statements)
argument list
1
(,)
control “
” 2

13. 
%c
%s
% d
% u
% f
% e e
%x
%o

14.  1.1
printf()
intmain( )
{ intsum=3;
printf(“ The sum is %d ”,sum);
return 0;
}
The sum is 3

15.  1.2
printf() %d %u
intmain( )
{ intnum = -3, tot = 5;
printf(“num = %d tot = %u ”,num,tot);
return 0;
}
num = -3 tot = 5

16. 1.3 printf()
%f %e 2
intmain( )
{ floatnum = 22.75;
printf(“ %.2fn%.2e ”,num,num);
return 0;
}
22.75
2.28e+01

17.  printf ( )
printf( )
print format

18. 
%d
%u
%f
%c 1
%s
1

19. 
n
t tab 8
a
Backslash

20. 
printf( )

21. 5 + 5 = 10
printf( ) string format

22. Hello word
3 2
data list

24. 
printf( )
string format
““
data list ““
printf( )
• d 2
• d a
• s b

25. 
f)
printf( )
f

27. 
6
printf( ) n)
printf( )
printf( )
n)
printf( )

28.  : scanf()
intscanf (<control>, <argument list>);
intscanf
(<control>, <argument
list>);
scanf()
(key board)

29. argument list
(,)
&
control
“”
printf

30.  2.1 scanf
intmain( )
{ intnum;
scanf( “ %d ”,&num);
return 0;
}
1
num

31. 2.2 scanf
intmain( )
{ intnum; charch;
scanf( “ %c ”,&ch);
scanf( “ %d ” ,&num);
printf(“ %d %c ” ,num, ch);
return 0;
}
2
1
num
1

32.  : expression
var = expression ;
var = expression ;
var
Expression

33.  : expression
var = expression ;
var = expression ;
var
Expression

34. 
sum = a b ;
a
b
sum

37.  –
putchar()
putchar()
intputchar (<character>);
putchar()
(Statements)

38. 1.4 putchar()
intmain( )
{ inta=65;
putchar(a);
putchar(„a‟);
return 0;
}
Aa

39. 2 getchar ( )
getchar ( )
1
enter
getchar ( );
getchar ( );

42. 3 getch ( )
getch ( )
1
enter
getch ( );

45. 4 getche ( )
getche ( )
1
enter
getche ( );

48.  3. –
3.1
#include <stdio.h>
intmain(){
intx_value = 9;
printf("x = %dn",x_value);
return0;
}

49.  3.2
#include <stdio.h>
intmain(){
intx,y,sum;
x = 7; y = 2;
sum = x + y;
printf("Total = %dn",sum);
return0;
}

50.  3.3
#include <stdio.h>
intmain(){
int x, y;
x = 7; y = 4;
--x; ++y;
printf("x = %2dn",x);
printf("y = %6dn",y);
return0;
}

51.  3.4
#include <stdio.h>
intmain(){
int profits, employees;
profits = 9; employees = 2 ;
printf("Each employee gets
%.2f", (float) profits/employees);
return0;
}

52.  3.5
include<stdio.h>
intmain(){
charany_char;
printf("Please type a character: ");
scanf("c%",&any_char);
printf("Thank you, your character are
%c",any_char);
return0;
}

53.  3.6
#include <stdio.h>
int main(){
printf("n****Using .1f****n");
printf("%.1f%.1f%.1fn", 4.0, 16.5, 589.3);
printf("%.1f%.1f%.1f", 400.0, 1600.5, 58900.3);
printf("nn****Using 8.1f****n");
printf("%8.1f%8.1f%8.1fn", 4.0, 16.5, 589.3);
printf("%8.1f%8.1f%8.1f", 400.0, 1600.5, 58900.3);
printf("%-8.1f%-8.1f%-8.1fn", 4.0, 16.5, 589.3);
printf("%-8.1f%-8.1f%-8.1f", 400.0, 1600.5,
58900.3);
return 0;
}

54.  3.7
#include <stdio.h>
int main(){
printf("n");
printf("xC9xCDxBBn");
printf("xC8xCDxBCn");
return 0;
}

55.  3.8
#include <stdio.h>
#include <ctype.h>
intmain(){
charany_char;
printf("Please type a lowercase letter:");
scanf("%c", &any_char);
if(any_char>= 'a')
printf("In uppercase: %c
n", toupper(any_char));
return0;
}

56.  –
string
char [ n ]
put
puts string_argument ;
string_argument

59. 
-
word
Char word [15] = * Example * ;
-
puts
puts word ;
puts ;

60.  gets
enter
gets
gets ; ;
string_var = get ;
string_var = get ;

63. 
-
enter
gets word ;
-
-printf you name is %s
n , word ;

64. 