Sum factorials from 1 to n

From , 4 Years ago, written in C, viewed 223 times.

/* 对1到n的阶乘求和 */
#include <stdio.h>
 
int main(void) {
        int i, j;
        int n = 0;
        int sum = 0;
        int product;
 
        printf("Please input n:"); /* 输入n */
        scanf("%d", &n);
 
        /* 外层循环：阶乘求和 */
        for (i = 1; i <= n; ++i) { /* 使用i作为外层循环变量名 */
                /* 内层循环：求i的阶乘 */
                for (j = 1, product = 1; j <= i; ++j) { /* 使用j作为内层循环变量名 */
                        product *= j; /* product为1到i的积 */
                }
                sum += product; /* sum为阶乘的和 */
        }
 
        printf("sum=%d\n", sum); /* 输出求和的结果 */
 
        return 0;
}
 

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Sum factorials from 1 to n

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