C++ :

#include <iostream>
using namespace std;
int main() {
    int score;
    int sum = 0, count = 0, pass_count = 0;
    int max_score = 0;
    int min_score = 0;
    bool flag = 0; // 标记第一个数字
    do {
        cin >> score;
        if (score != -1) {
            sum += score;
            count++;
            if (score >= 60) {
                pass_count++;
            }
            if (flag == 0){
                flag = 1;
                max_score = score;
                min_score = score;
            }
            if (score > max_score) {
                max_score = score;
            }
            if (score < min_score) {
                min_score = score;
            }
        }
    } while (score != -1);
    if (count > 0) {
        cout << "最高分: " << max_score << endl;
        cout << "最低分: " << min_score << endl;
        cout << "平均分: " << (double)sum / count << endl;
        cout << "及格率: " << (double)pass_count / count * 100 << "%";
    } 
    return 0;
}