Summary: Factorial is represented using '!',

so five factorial will be written as (5!),

n factorial as (n!).Also

n! = n*(n-1)*(n-2)*(n-3)...3.2.1 and

zero factorial is defined as one i.e. 0! = 1.

*/

#include<stdio.h>

int fact(int);

int main(){

int num,f;

printf("\nEnter a number: ");

scanf("%d",&num);

f=fact(num);

printf("\nFactorial of %d is: %d",num,f);

return 0;

}

//recursive function

int fact(int n){

if(n==1)

return 1;

else

return(n*fact(n-1));

}

_______________________________OUPUT______________________________

Enter a number: 6

Factorial of 6 is: 720

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