Write a menu driven program which has the following options: (1) Factorial of a Number (2) Prime or not (3) Odd or even (4) Exit. [Make use of Switch Statement]

Source Code :

#include<stdio.h>

void main()

{

      int n,ch,i,fl=0,fact=1;

      clrscr();

      printf("\n1. Factorial of a Number");

      printf("\n2. Prime or Not");

      printf("\n3. Odd or Even");

      printf("\n4. Exit");

      printf("\nEnter Your Choice : ");

      scanf("%d",&ch);

      switch(ch)

      {

            case 1:

            {

                  printf("\nEnter a Number : ");

                  scanf("%d",&n);

                  for(i=1;i<=n;i++)

                        fact*=i;

                  printf("\nFactorial : %d",fact);

            }break;

            case 2:

            {

                  printf("\nEnter a Number : ");

                  scanf("%d",&n);

                  for(i=2;i<n;i++)

                        if(n%i==0)

                              fl=1;

                  if(fl==1)

                        printf("\nNumber is Not Prime");

                  else

                        printf("\nNumber is Prime");

            }break;

            case 3:

            {

                  printf("\nEnter a Number : ");

                  scanf("%d",&n);

                  if(n%2==0)

                        printf("\nEven Number");

                  else

                        printf("\nOdd Number");

            }break;

            case 4:

                  exit(0);

            default:

                  printf("\nInvalid Choice!!!");

      }

      getch();

}

Output :

1. Factorial of a Number

2. Prime or Not

3. Odd or Even

4. Exit

Enter Your Choice : 1

Enter a Number : 5

Factorial : 120