c语言中调用函数求阶乘

Question

 

Answer 1

#include <stdio.h>
int f(int n){
    if(n==1)
        return 1;
    else
        return n*f(n-1);
}
int main()
{
    int i,n,m;
    float j;
    scanf("%d %d",&m,&n);
    j=f(m)*1.0/f(n)*f(m-n);
    printf("%f",j);

    return 0;
}