C语言求一个数的阶乘

下面的代码将不停的计算你输入的整数的阶乘，直到输入一个非负数，结束程序。

#include <stdio.h>

int fact(int n);

int main(void) {
    int current;

    printf("Enter a positive integer [to terminate enter non-positive] > ");
    scanf("%d", &current);
    while (current > 0) {
        printf("The factorial of %d is %d\n", current, fact(current));
        printf("Enter a positive integer [to terminate enter non-positive] > ");
        scanf("%d", &current);
    }
}

// 如果 n 是一个正整数，fact() 将返回 n 的阶乘
int fact(int n) {
    int lcv; // 循环控制变量
    int p;

    for(p=1, lcv=2; lcv <= n; p=p*lcv, lcv++);
    return p;
}

可能的输出结果：
Enter a positive integer [to terminate enter non-positive] > 3
The factorial of 3 is 6

Enter a positive integer [to terminate enter non-positive] > 6
The factorial of 6 is 720

Enter a positive integer [to terminate enter non-positive] > 10
The factorial of 10 is 3628800

Enter a positive integer [to terminate enter non-positive] > 4
The factorial of 4 is 24

Enter a positive integer [to terminate enter non-positive] > 0