循环嵌套示例及练习2:求1!+2!+3!+4!+5!(for循环嵌套while循环)

循环嵌套示例：

for (int i = 1; i <= 5; i++) {
    for (int j = 1; j <= i; j++) {
        printf("*");
    }
    printf("\n");
}

输出结果为：

*
**
***
****
*****

练习2代码如下：

int sum = 0;
int i = 1;
while (i <= 5) {
    int j = 1;
    int factorial = 1;
    while (j <= i) {
        factorial *= j;
        j++;
    }
    sum += factorial;
    i++;
}
printf("1!+2!+3!+4!+5!=%d\n", sum);

输出结果为：

1!+2!+3!+4!+5!=153