每日一练——第四题
题目：从键盘输入a和n的值计算sum = a + aa + aaa + …aaaa…
#include<stdio.h>int main(){int calculate_sum(int a, int n);int a, n;printf("请输入a和n的值：\n");scanf("%d%d", &a, &n);int sum_total = calculate_sum(a, n);printf("计算结果为： sum = %d\n", sum_total);return 0;
}int calculate_sum(int a, int n){int sum = 0, current = 0;//控制循环次数为n次for(int i = 0; i < n; i ++){current = current * 10 + a;sum += current;//把它加到sum上去}return sum;}