C program to perform some task as factorial of a number, prime or not and odd or even | My CS Tutorial

             C PROGRAM

Write a menu driven c program which perform following options:

• Factorial of a number
• Prime or not
• Odd or even
• Exit

Once a menu item is selected the appropriate action should be taken and once this action is finished, the menu should reappear. Unless the user selects the ‘Exit’ option the program should continue to run.

Factorial, even or odd and prime or not in a c program | My CS Tutorial

C PROGRAM SOURCE CODE

#include<stdio.h>
#include<conio.h>
int main()
{
    int c=0, num, res, n, flag=0, i;
    clrscr();
 
    while(c!=4)
    {
        //display menu
     
        printf("\n 1. Factorial of a number\n 2. Prime or not\n 3. Odd or even\n 4. Exit\n");

        //display choice option to the user
     
        printf("\n Enter your choice:");
        scanf("%d", &c);

        //write case statement for Four options

        switch(c)
        {
            //For factorial block
            case 1:

                //code for factorial functionality
             
                printf("\n Enter an integer: ");
                scanf("%d", &num);
                n=num;
                res=num;
                while(num>1)
                {
                    res = res*(num-1);
                    num = num-1;
                }
                printf("\n Factorial of %d is %d. \n\n",n, res);
                break;

            //For prime block
            case 2:

                //functionality of Prime or not

                printf("\n Enter an integer: ");
                scanf("%d", &num);
                n=num;

                for(i=2;i<=n/2;i++)
                {
                    if(num%i==0)
                    {
                        flag=1;
                        break;
                    }
                }

                //for number "1" it's neither prime nor composite
             
                if(num==1)
                    printf("\n 1 is neither prime nor composite");
                else
                {
                        if(flag==0)
                            printf("\n %d is Prime Number.\n\n", n);
                        else
                            printf("\n %d is not a Prime Number.\n\n", n);
                }
                break;

            //For Odd-even block
            case 3:

                //functionality for Odd-even
                printf("\n Enter an integer: ");
                scanf("%d", &num);
                n=num;

                if(num%2==0)
                    printf("\n %d is Even Number.\n\n",n);
                else
                    printf("\n %d is Odd Number.\n\n",n);
                break;

            //For Exit block
         
            case 4:
                printf("\n Exit");
                break;
        }
    }
}

OUTPUT:-

1. Factorial of a number
 2. Prime or not
 3. Odd or even
 4. Exit

 Enter your choice:1

 Enter an integer: 5

 Factorial of 5 is 120.


 1. Factorial of a number
 2. Prime or not
 3. Odd or even
 4. Exit

 Enter your choice:2

 Enter an integer: 29

 29 is Prime Number.


 1. Factorial of a number
 2. Prime or not
 3. Odd or even
 4. Exit

 Enter your choice:3

 Enter an integer: 53

 53 is Odd Number.


 1. Factorial of a number
 2. Prime or not
 3. Odd or even
 4. Exit

 Enter your choice:4

 Exit

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Created by-- HARSH CHAUHAN