c - C 中的阶乘算法 : way to store result of previous iteration in a string?

Question

我刚刚开始使用 C 语言编程，我只知道如何用其他语言编写一些非常简单的程序。不管怎样，我正在制作一个迭代阶乘计算器(当前进度可以在下面看到)，并且我不确定如何存储“factorial_value”以便在循环的下一次迭代中使用。如果我按原样运行代码，那么“factorial_value”只会将其自身重置为该迭代中等于的任何user_number * (user_number - step)，而不是保留上一次迭代的值并将其相乘编号乘以成功的编号。

是否有某种方法可以将每次迭代的结果附加到字符串中，然后在后续的每个步骤中提取适当的值来存储每次迭代的结果？

#include <stdio.h>

int main()
{
    int user_number;
    int factorial_value = user_number;
    int step = 1;


    printf("Enter the nubmer you would like to get the factorial of: ");
    scanf("%d!",&user_number);

    while (step < user_number) {
        factorial_value = factorial_value * (user_number - step);

        step++;
    }

    printf("\n%d! = %d\n",user_number,factorial_value);

    return 0;
}

Answer 1

在从用户那里获取factorial_value后，您没有将factorial_value设置为user_number；

#include <stdio.h>

int main()
{
    int user_number;
    int factorial_value;
    int step = 1;

    printf("Enter the nubmer you would like to get the factorial of: ");
    scanf("%d!",&user_number);
    factorial_value = user_number;
    while (step < user_number) {
        factorial_value = factorial_value * (user_number - step);

        step++;
    }

    printf("\n%d! = %d\n",user_number,factorial_value);

    return 0;
}