Factorial of a number

// C program to calculate factorial of a number.
#include<stdio.h>
int main(){
int i,x,s=1;
printf("ENTER A INTEGER NUMBER :");
scanf("%d",&x);

for(i=1;i<=x;i++){
    s*=i;
}
printf("Factorial of %d = %d\n",x,s);
return 0;
}