GESP 2026年9月 C++三级 单选题 第9题

#include <iostream>
using namespace std;
int main() {
    int n = 0;
    cin >> n;
    for (int i = 0; i < n; i++) {
        char str[11];
        cin >> str;
        char max = '0';
        for (int i = 0; str[i] != '\0'; i++)
            if (str[i] > max)
                max = str[i];
        _____________________________
    }
    return 0;
}

• A. cout << (max <= '1') << " " << (max <= '7') << " " << (max <= '9') << " " << (max <= 'F') << endl;
• B. cout << (max <= 1) << " " << (max <= 7) << " " << (max <= 9) << " " << (max <= 'F') << endl;
• C. cout << (max <= 1) << " " << (max <= 7) << " " << (max <= 9) << " " << (max <= F) << endl;
• D. cout << (max >= 1) << " " << (max >= 7) << " " << (max >= 9) << " " << (max >= F) << endl;

正确答案：A