C语言实现阶乘的示例详解

#include <stdio.h>
int main()
{
    int i = 1;
    int n = 0;
    int jieceng = 1;
    scanf("%d", &n);                      //输入想得到的阶层数
    while (i <= n)
    {
        jieceng *= i;
        i++;
    }
    printf("%d的阶层是%d\n", n, jieceng);
    return 0;
}

#include <stdio.h>
int main()
{
    int i = 1;
    int n = 0;
    int jieceng = 1;
    scanf("%d", &n);
    do
    {
        jieceng *= i;
        i++;
 
    } while (i <= n);
    printf("%d的阶层是%d\n", n, jieceng);
    return 0;
}

#include <stdio.h>
int main()
{
    int i = 1;
    int n = 0;
    int jieceng = 1;
    scanf("%d", &n);
    for (i = 1; i <= n; i++)
    {
        jieceng *= i;
    }
    printf("%d的阶层是%d\n", n, jieceng);
    return 0;
}

#include<stdio.h>
int main()                                         //算1~n阶层相加
{
    int sum = 0;
    int jiecen = 0;
    int i = 0;
    int j = 0;
    int n = 0;
    scanf("%d", &n);                               //设置想要到达的n值
    for (j = 1; j <= n; j++)
    {
        for (i = 1, jiecen =1; i <= j; i++)         //重置jieceng，使每次从1开始
        {
            jiecen = jiecen * i;                   //里循环得每一相应阶层数
        }
        sum += jiecen;                             //阶层之和
    }
    printf("%d\n", sum);
    return 0;
}

#include <stdio.h>
int main()                                         //算1~10阶层相加(j简短版）好**
{
    int sum = 0;
    int jiecen = 1;
    int i = 0;
    int n = 0;
    scanf("%d", &n);
    for (i = 1; i <= n; i++)
    {
        jiecen = jiecen * i;
        sum += jiecen;
    }
    printf("%d\n", sum);
    return 0;
}