Question

我打电话给两个函数，分别找到最高和最低的成绩。它们返回“ highestGrade”和“ lowestGrade”，但是我很困惑为什么在编译时会出现错误。这是一个实验室作业，大多数代码是预先编写的，我的任务是填写缺少的代码。该错误发生在第55和63行附近，我要引用的功能在代码的末尾。

我对使用数组不熟悉，因此我假设在函数“ findHighest”和“ findLowest”中可能包含一些错误代码。例如，“ findHighest”中的程序将假定它遇到的第一个数组是最高等级，并将与其余数组进行比较，直到找到更高的数组为止。如果是，它将为该数组分配“ highestGrade”。

float findAverage(const GradeType, int);
int findHighest(const GradeType, int);
int findLowest(const GradeType, int);

int main()
{
    GradeType  grades;
    int  numberOfGrades;
    int pos;

    float avgOfGrades;
    int highestGrade;
    int lowestGrade;

    // Read in the values into the array
    pos = 0;
    cout << "Please input a grade from 1 to 100, (or -99 to stop)" << endl;
    cin >> grades[pos];
    int i = 1;

    while (grades[pos] != -99)
    {
        // read in more grades
        pos = i;
        cout << "Please input a grade from 1 to 100, (or -99 to stop)" << endl;
        cin >> grades[pos];
    }

    numberOfGrades = pos;  // Fill blank with appropriate identifier
                           // call to the function to find average
    findAverage(grades, numberOfGrades);
    avgOfGrades = findAverage(grades, numberOfGrades);
    cout << endl << "The average of all the grades is " << avgOfGrades << endl;

    //  Fill in the call to the function that calculates highest grade
    findHighest(grades, highestGrade);
    highestGrade = findHighest(grades, highestGrade);
    cout << endl << "The highest grade is " << highestGrade << endl;

    // Fill in the call to the function that calculates lowest grade
    findLowest(grades, lowestGrade);
    // Fill in code to write the lowest to the screen
    lowestGrade = findLowest(grades, lowestGrade);

    cout << endl << "The lowest grade is " << lowestGrade << endl;

    return 0;
}

float findAverage(const GradeType  array, int size)
{
    float sum = 0;   // holds the sum of all the numbers

    for (int pos = 0; pos < size; pos++)
        sum = sum + array[pos];

    return (sum / size);  //returns the average
}

int   findHighest(const GradeType array, int size)
{
    // Fill in the code for this function
    float highestGrade = array[0];

    for (int i = 0; i < size; i++)
    {
        if (array[i] > highestGrade)
            highestGrade = array[i];
    }

    return highestGrade;
}

int   findLowest(const GradeType array, int size)
{
    // Fill in the code for this function
    float lowestGrade = array[0];

    for (int i = 1; i < size; i++)
    {
        if (array[i] < lowestGrade)
            lowestGrade = array[i];
    }

    return lowestGrade;
}

由于该错误，程序无法输出最高和最低成绩。

Answer 1

import * as Config from "../utils/Config";


jest.mock("../utils/Config", () => ({
      getConfig: () => ({ ApiUrl: 'yourMockApiUrl' })
}));

在初始化之前，您正在使用findLowest(grades, lowestGrade);。

lowestGrade

应该是

int lowestGrade;

当然，作为更好的C ++，请在需要它之前声明它，而不是在函数顶部。

其他变量也是如此。

如果逻辑正确，所有这些当然都可以了。为什么在函数中传递最低/最高等级作为大小参数？

“使用未初始化的局部变量”

1 个答案: