/*
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
