#include<bits/stdc++.h> using namespace std; int main() { //数组 //1.新建数组 int n; cin >> n; int a[n]; //2.数组赋值 for (int i = 0; i < n; i++) { cin >> a[i]; } //3.输出数组 for (int i = 0; i < n; i++) { cout << a[i] << " "; } //4.求总和：累加器 int s = 0; //累加器初始化为0; for (int i = 0; i <= n - 1; i++) { s = s + a[i]; } cout << endl << s << endl; //5.求平均值 double avg = s * 1.0 / n; printf("%.2f\n", avg); //6.求3的倍数的和 int s3 = 0; //累加器初始化为0; for (int i = 0; i < n; i++) { if (a[i] % 3 == 0) { s3 = s3 + a[i]; } } cout << s3 << endl; return 0; }