C ++中的switch语句 [英] Switch statement in C++

问题描述

考虑:

#include <iostream>

using namespace std;

int main()
{
    int score;
    char grade;
    cout << "Enter your score: " << endl;
    cin >> score;
    if (score >= 90)
        grade = 'a';
    if (score >= 80)
        grade = 'b';
    if (score >= 70)
        grade = 'c';
    if (score >= 60)
        grade = 'd';
    else
        grade = 'f';

    cout << grade << endl;

    switch (grade) {
        case 'a':
            cout << "Good job" << endl;
            break;
        case 'c':
            cout << "Fair job" << endl;
            break;
        case 'f':
            cout << "Failure" << endl;
            break;
        default:
            cout << "invalid" << endl;
    }

    cin.get();
    return 0;
}

为什么我应该输入大小写"a"时输入 95 时会给出默认的切换大小写?

Why is it giving my default switch case when I enter 95 when I should be getting case 'a'?

推荐答案

您错过了一堆 else ，或者以错误的顺序进行了比较.

You're missing a bunch of elses, or doing the comparisons in the wrong order.

95大于90，但也大于80、70和60.因此，您将得到一个'd'.

95 is greater than 90, but it's also greater than 80, 70 and 60. So you'll get a 'd'.

(而且您不在交换机中处理'd'.)

(And you're not handling 'd' in your switch.)

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