C语言函数计算 a+aa+aaa+...+aaa(n个a) 的值

#include <stdio.h> int fun(int a, int n) { int sum = 0; int temp = a; for (int i = 1; i <= n; i++) { sum += temp; temp = temp * 10 + a; } return sum; } int main() { int a, n; scanf("%d%d", &a, &n); printf("%d\n", fun(a, n)); return 0; }