2-11

#include<stdio.h>
double fact(int n);
int main(void)
{
    int i,n;
    double result;
    printf("Enter n:");
    scanf_s("%d",&n);
    for(i=1;i<=n;i++){
        result=fact(i);
        printf("%d!=%.0f\n",i,result);
    }
    return 0;
}
double fact(int n)
{
    int i;
    double product;
    product=1;
    for(i=1;i<=n;i++){
        product=product*i;
    }
    return product;
}