Question

尝试编写一个简单的程序，它取六个测试等级，由用户输入，降低最低，然后显示其余五个的平均值。该程序编译良好，但输出错误的答案。任何指向逻辑错误发生位置的指针都会有所帮助。我使用这些值作为样本等级： 85.2 92.3 78.0 51.5 91.6 87.0 返回的值应为86.82，但程序返回80.08。

<script>
var theimagestwo = new Array();
Draggablenumber[1] = $("#draggable1");
DraggableNumber[2] = $("#draggable2");

Answer 1

你的问题可能来自于你使用const int进行双精度除法的事实。如果您将SIZE转换为double，并在末尾用.0写下剩余的双数字，那么它可以正常工作：

#include <iostream>

using namespace std;

const int SIZE = 6;
double grades[SIZE];
double low(double[]);

int main()
{
    double preavg = 0.0;
    double avg = 0.0;

    cout << "This program will take an input of six test grades\n"
         << "and determine the average of the highest five grades.\n\n"
         << "Please input the first test grade\n";
    cin >> grades[0];
    cout << "Please input the second test grade\n";
    cin >> grades[1];
    cout << "Please input the third test grade\n";
    cin >> grades[2];
    cout << "Please input the fourth test grade\n";
    cin >> grades[3];
    cout << "Please input the fifth test grade\n";
    cin >> grades[4];
    cout << "Please input the sixth test grade\n";
    cin >> grades[5];

    for (int i = 0; i < SIZE; i++)
    {
        preavg += grades[i];
    }

    avg = (preavg - low(grades)) / ((double)SIZE - 1.0);

    cout << "Your average grade is " << avg << "\n";

    system("PAUSE");

    return 0;
}

double low(double grades[SIZE])
{
    double lowest;

    lowest = 100.0;
    for (int i = 0; i < SIZE; i++)
    {
        if (grades[i] < lowest)
        lowest = grades[i];
    }

    return lowest;
}

简单的评分程序返回错误的答案

1 个答案: