C Program To Find Factorial of given numbers,+ve numbers – Menu Driven Program

#include<stdio.h>

int fact(int);

int mul(int,int);

int add(int,int);

int main()

{

int num1,num2,cho;

char c1;

while(1)

{

printf("\n*******SELECT ANY ONE OF THE FOLLOWING OPTION*****\n");

printf("\n1. factorial of a given +ve number\n2. product of given two numbers\n3. sum of given two numbers\n");

scanf("%d",&cho);

switch(cho)

{

case 1:

printf("\nEnter a +ve number\n");

scanf("%d",&num1);

printf("factorial of given number is = %d",fact(num1));

break;

case 2:

printf("\nEnter two +ve number\n");

scanf("%d%d",&num1,&num2);

printf("product of given 2 numbers is = %d",mul(num1,num2));

break;

case 3:

printf("\nEnter two +ve number\n");

scanf("%d%d",&num1,&num2);

printf("sum of given 2 numbers is = %d",add(num1,num2));

break;

default:

printf("*******ENTERED OPTION IS WRONG OPTION******");

}

printf("\nDO YOU WANT CONTINUE y/n\n");

fflush(stdin);

scanf("%c",&c1);

if(c1 == 'y' || c1 =='Y')

continue;

else

break;

}

return(0);

}

int fact(int num1)

{

if(num1 == 0)

return 1;

else

return num1 * fact(num1-1);

}

int add(int num1,int num2)

{

if(num2 == 1)

return num1+1;

else

return add(num1+1,num2-1);

}

int mul(int num1,int num2)

{

if(num2 == 1)

return num1;

else

return num1 + mul(num1,num2-1);

}