Factorisation

#include<stdio.h>
int rec(int);
int main ()
{
    int a,fact;
    printf("enter any number:- ");
    scanf("%d",&a);
    fact=rec(a);
    printf("factorial value=%d\n",fact);
    return 0;
}
int rec(int x)
{
    int f;
    if(x==1)
        return(1);
    else
    f=x*rec(x-1);
    return (f);   
}