Semester 1. Practical File for Introduction to computers and programming in C Lab

1. 1

2. 2
(Basics)
1. WAP to print text on the screen.
2. WAP to check if number is odd or even.
3. WAP to check which of the two entered numbers is greater.
4. WAP to check whether entered number is a leap year or not.
5. WAP to convert temperature in Fahrenheit to Celsius.
(Looping)
6. WAP to display the multiplication table of entered number.
7. WAP to check if number is Palindrome or not.
8. WAP to check if number is an Angstrom number or not.
9. WAP to check if number is a prime or not.
10.WAP to find the sum of Fibonacci series.
(Arrays)
11.WAP to find the sum and average of 10 numbers using arrays.
12.WAP to add elements of two 3x3 matrices.
(Pointers & Functions)
13.WAP to understand pointers.
14.WAP to swap two numbers.
15.WAP to Swap two numbers using pointers (and functions).
16.WAP to find the factorial of a number using recursive function.
(Structures)
17.WAP using structures to input and display details of student.
(Strings)
18.WAP to enter two strings and get them to display.
(Data File Handling)
19.WAP to enter and retrieve a character from a file.
20.WAP to copy the contents of one file to another.
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3. 3
Write a Program to display text on screen.
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#include<stdio.h>
int main()
{
printf(" Welcome to Neil's Practical File. XD ");
return 0;
}
OUTPUT:
Welcome to Neil's Practical File. XD

4. 4
Write a Program to check if number is odd or even.
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#include<stdio.h>
int main()
{
int num;
printf(" Enter the number: ");
scanf(" %d ", &num);
if(num%2==0)
printf("n Number is Even. ");
else
printf("n Number is Odd. ");
return 0;
}
OUTPUT:
Enter the number: 5
Number is Odd.
Enter the number: 8
Number is Even.

5. 5
Write a Program to check which of the two entered
numbers is greater.
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#include <stdio.h>
main ()
{
int a,b,c;
printf("n Enter two Numbers: ");
scanf("%d%d",&a,&b);
c=a ? b:a ;
printf("n Greater number of the two is : %d n",c);
}
OUTPUT:
Enter two Numbers: 5 357
Greater number of the two is : 357

6. 6
Write a Program to check whether entered number is a
leap year or not.
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#include <stdio.h>
main()
{
int Y;
printf("Enter any year: ");
scanf("%d", &Y);
if((Y%4==0))
printf("nThe entered year is a Leap Year.");
else
printf("nThe entered year is not a Leap Year.");
return 0;
}
OUTPUT:
Enter any year: 1991
The entered year is not a Leap Year.
Enter any year: 1994
The entered year is a Leap Year.

7. 7
Write a Program to convert temperature in Fahrenheit
to Celsius.
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#include <stdio.h>
int main()
{
float Tf, Tc;
printf("Enter temperature in Farenheit: ");
scanf("%f", &Tf);
Tc=((Tf-32)*(5.0/9.0));
printf("The temperature in Celcius is %f", Tc);
return 0;
}
OUTPUT:
Enter temperature in Farenheit: 98.6
The temperature in Celcius is 37.000000

8. 8
Write a Program to display the multiplication table of
entered number.
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#include<stdio.h>
int main()
{
int i,n,a;
printf("nEnter the number whose table is to be printed : ");
scanf("%d",&n);
for(i=1;i<11;i++)
{
a=n*i;
printf("%dx%i=%d n",n,i,a);
}
return 0;
}
OUTPUT:
Enter the number whose table is to be printed : 5
5x1=5
5x2=10
5x3=15
5x4=20
5x5=25
5x6=30
5x7=35
5x8=40
5x9=45
5x10=50

9. 9
Write a Program to check if number is Palindrome or
not.
SOURCE CODE:
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#include <stdio.h>
main()
{
int num; //number inputted by user
int n; //temporary storage
int rev=0; //stores the reverse of that number
int digit; //stores the individual digits
printf(" Enter the number to check if it's Palindrome or not:
");
scanf("%d", &num);
n=num;
do
{
digit=n%10;
rev=(rev*10)+digit;
n=n/10;
}
while(n>0);
if(rev==num)
{
printf("n The number is a palindrome. ");
}
else
{
printf("n The number is not a palindrome. ");
}
}
OUTPUT:
Enter the number to check if it's Palindrome or not: 121
The number is a palindrome.
Enter the number to check if it's Palindrome or not: 153
The number is not a palindrome.

10. 10
Write a Program to check if number is an Angstrom
number or not.
SOURCE CODE:
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#include <stdio.h>
main()
{
int num; //number inputted by user
int n; //temporary storage
int A=0; //stores the sum of the cube of the digits
int digit; //stores the individual digits
printf(" Enter the number to check if it's Angstrom or not:
");
scanf("%d", &num);
n=num;
do
{
digit=n%10;
A+=(digit*digit*digit);
n=n/10;
}
while(n>0);
if(A==num)
{
printf("n The number is an Angstrom number. ");
}
else
{
printf("n The number is not an Angstrom number. ");
}
}
OUTPUT:
Enter the number to check if it's Angstrom or not: 121
The number is not an Angstrom number.
Enter the number to check if it's Angstrom or not: 153
The number is an Angstrom number.

11. 11
Write a Program to check if number is a prime or not.
SOURCE CODE:
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#include<stdio.h>
int main()
{
int num;
printf("n Enter the number to check whether prime or not:
");
scanf(" %d ",&num);
if( num==0 || num==1 )
{
printf("n The number is not prime. ");
}
else
{
int i=0;
int flag=1; // 1 if prime, 0 if not prime
for(i=2; i<num; i++)
{
if(num%i==0)
{
flag=0;
break;
}
}
if(flag==1)
{
printf("n The number is prime. ");
}
else
{
printf("n The number is not prime ");
}
}return 0;
}
OUTPUT:
Enter the number to check whether prime or not: 1
The number is not prime.
Enter the number to check whether prime or not: 5
The number is prime.
Enter the number to check whether prime or not: 12
The number is not prime.

12. 12
Write a Program to find the sum of Fibonacci series.
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#include<stdio.h>
main()
{
int sum=0;
int n;
printf("n Till which term should the Fibonacci series be
found: ");
scanf(" %d ", &n);
printf("n The Fibonacci Series: n ");
if( n==0 )
{
printf(" None ");
}
else if( n==1 )
{
printf("0");
}
else
{
int i,temp;
int first=0,second=1;
//2nd term
printf("%d + %d ",first,second);
sum+=second;
for(i=3; i<=n; i++) //3rd term onwards
{
temp=second;
second=second+first;
first=temp;
printf("+ %d ",second);
sum+=second;
}
}
printf("n Sum = %d",sum);
}
OUTPUT:
Till which term should the Fibonacci series be found: 8
The Fibonacci Series:
0 + 1 + 1 + 2 + 3 + 5 + 8 + 13
Sum = 33

13. 13
Write a Program to find the sum and average of 10
numbers using arrays.
SOURCE CODE:
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#include <stdio.h>
int main()
{
//INITIAL DECLARATIONS
int x[10];
int sum=0;
float avg;
int i;
//INPUT
printf("n Enter the 10 numbers: n ");
for(i=0; i<10; i++)
{
scanf(" %d ", &x[i]); // *Note the & for array element
}
//CALCULATIONS
for(i=0; i<10; i++)
{
sum+=x[i];
}
avg=sum/10.0;
//OUTPUT
printf("n The Sum of the numbers: %d ",sum);
printf("n The Average of the numbers: %f n",avg);
return 0;
}
OUTPUT:
Enter the 10 numbers:
1 2 3 4 5 6 7 8 9 10
The Sum of the numbers: 55
The Average of the numbers: 5.500000

14. 14
Write a Program to add elements of two 3x3 matrices.
SOURCE CODE:
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#include<stdio.h>
int main()
{
int A[3][3], B[3][3];
int i,j;
//INPUT of MATRIX/ 2D ARRAY A
printf("n Enter the elements of matrix A: n");
for(i=0; i<3; i++)
{
for(j=0; j<3; j++)
{
scanf(" %d ", &A[i][j]);
}
}
//INPUT of MATRIX/ 2D ARRAY B
printf("n Enter the elements of matrix B: n");
for(i=0; i<3; i++)
{
for(j=0; j<3; j++)
{
scanf(" %d ", &B[i][j]);
}
}
//ADDING THE TWO MATRICES
printf("n Adding matrices A and B = matrix C ");
int C[3][3];
for(i=0; i<3; i++)
{
for(j=0; j<3; j++)
{
C[i][j]=A[i][j]+B[i][j];
}
}
//OUTPUT
printf("n Matrix C is: n");
for(i=0; i<3; i++)
{
for(j=0; j<3; j++)
{
printf(" %d ", C[i][j]);
}
printf("n");
}
return 0;
}

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OUTPUT:
Enter the elements of matrix A:
1 2 3
1 2 3
3 2 1
Enter the elements of matrix B:
3 2 1
3 2 1
1 2 3
Adding matrices A and B = matrix C
Matrix C is:
4 4 4
4 4 4
4 4 4

16. 16
Write a Program to understand pointers.
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#include <stdio.h>
main()
{
int a,*p;
printf("Enter an integer: ");
scanf("%d",&a);
p = &a;
printf("nAddress of a: %u", &a);
printf("nnAddress of p: %u", &p);
printf("nnValue of p: %d", p);
printf("nnValue of a: %d", a);
printf("nnValue of a: %d", *p);
}
OUTPUT:
Enter an integer: 7
Address of a: 3219592736
Address of p: 3219592732
Value of p: -1075374560
Value of a: 7
Value of a: 7

17. 17
Write a Program using structures to input and display
details of student.
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#include <stdio.h>
struct student
{
char name[20];
float marks;
int age;
}b1, b2;
main()
{
printf("n Enter Names, Marks & Age of the students:
n");
scanf("%s %f %d",&b1.name,&b1.marks,&b1.age);
scanf("%s %f %d",&b2.name,&b2.marks,&b2.age);
printf("n This is what you have entered: n");
printf("n %s %f %d ",b1.name,b1.marks,b1.age);
printf("n %s %f %d ",b2.name,b2.marks,b2.age);
}
OUTPUT:
Enter Names, Marks & Age of the students:
Neil 94 18
Bugger 0 100
This is what you have entered:
Neil 94.000000 18
Bugger 0.000000 100

18. 18
Write a program to swap two numbers.
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#include<stdio.h>
int main()
{
int a,b;
printf("n Enter the value of A: ");
scanf("%d",&a);
printf(" Enter the value of B: ");
scanf("%d",&b);
//Swapping:
int temp;
temp=a;
a=b;
b=temp;
printf("n After Swapping... n");
printf(" A: %d", a);
printf("n B: %d", b);
return 0;
}
OUTPUT
Enter the value of A: 5
Enter the value of B: 10
After Swapping...
A: 10
B: 5

19. 19
Write a Program to Swap two numbers using pointers.
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#include<stdio.h>
void Swap(int *a, int *b)
{ // *Note the syntax of pointers for arguments
//Swapping:
int temp;
temp=*a; // *(pointer_variable) to access the value
*a=*b;
*b=temp;
}
int main()
{
int a,b;
printf("n Enter the value of A: ");
scanf("%d",&a);
printf(" Enter the value of B: ");
scanf("%d",&b);
Swap(&a,&b); // *Note the & during such a call
printf("n After Swapping... n");
printf(" A: %d", a);
printf("n B: %d", b);
return 0;
}
OUTPUT:
Enter the value of A: 4
Enter the value of B: 9
After Swapping...
A: 9
B: 4

20. 20
Write a Program to find the factorial of a number using
recursive function.
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#include<stdio.h>
int fact(int f)
{
if( f==1 || f==0)
{ return 1; }
else
{
f=f*fact(f-1);
return f;
}
}
main()
{
int num;
int factorial;
printf(" Enter the number whose factorial needs to be found:
");
scanf(" %d ", &num);
factorial=fact(num);
printf("n The factorial of %d is %d. ",num,factorial);
}
OUTPUT:
Enter the number whose factorial needs to be found: 0
The factorial of 0 is 1.
Enter the number whose factorial needs to be found: 4
The factorial of 4 is 24.

21. 21
Write a Program to enter two strings and get them to
display.
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#include <stdio.h>
int main()
{
char S1[20];
char S2[20]; //the datatype string doesn't exist in C.
//method 1: can only take one word at a time (till spaces).
printf("n Enter the first string: ");
scanf(" %s ", S1);
//method 2: can take whole line including spaces.
printf(" Enter the second string: ");
gets(S2);
printf("n The Strings are:n 1st: %sn 2nd: ",S1);
puts(S2);
return 0;
}
OUTPUT:
Enter the first string: Hello
Enter the second string: World
The Strings are:
1st: Hello
2nd: World
Enter the first string: New York
Enter the second string:
The Strings are:
1st: New
2nd: York

22. 22
Write a Program to enter and retrieve a character from
a file using DATA FILE HANDLING.
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#include <stdio.h>
main()
{
char ch;
FILE *file;
file = fopen("abc.txt", "w");
printf("nEnter any character into FILE: ");
scanf("%c", &ch);
putc(ch, file);
fclose(file);
file = fopen("abc.txt", "r");
ch = getc(file);
printf("nEntered Character from FILE: %c", ch);
}
OUTPUT:
Enter any character into FILE: Y
Entered Character from FILE: Y

23. 23
Write a program to copy the contents of one file to
another using DATA FILE HANDLING.
SOURCE CODE:
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#include <stdio.h>
main()
{
char ch;
FILE *fp1, *fp2;
fp1 = fopen("abc.txt", "r");
fp2 = fopen("xyz.txt", "w");
while((ch = getc(fp1)) != EOF)
putc(ch, fp2);
fclose(fp1);
fclose(fp2);
return 0;
}
OUTPUT:
(none)