使用数组调用函数 - C++

Calling a function with Arrays - C++

本文关键字：C++ 函数 调用 数组      更新时间：2023-10-16
//Write a program that will input letter grades (A, B, C, D, F), the number of 
//which is input by the user (a maximum of 50 grades). The grades will be read 
//into an array. A function will be called five times (once for each letter grade) 
//and will return the total number of grades in that category. The input to the 
//function will include the array, number of elements in the array and the letter
//category (A, B, C, D or F). The program will print the number of grades that 
//are A, B, etc.
#include <iostream>
using namespace std;
double countGrade(char letterCategory, int size, char array);
const int SIZE = 5;
char letterCategory[SIZE] = {'A', 'B', 'C', 'D', 'F'};
char userLetters[50];
int main()
{
    // Declare Variables
    int numberOfGrades = 0;
    int gradeNumbersA = 0;
    int gradeNumbersB = 0;
    int gradeNumbersC = 0;
    int gradeNumbersD = 0;
    int gradeNumbersF = 0;
    // Get the number of grades to be read
    cout << "Please input the number of grades to be read in. (1-50): ";
    cin >> numberOfGrades;
        // Input Validation
        if(numberOfGrades < 1 || numberOfGrades > 50)
        {
            cout << "Error! Invalid Input. Please enter a number between 1 and 50.n";
            cin >> numberOfGrades;
        }
        while(numberOfGrades < 1 || numberOfGrades > 50);
        cout << "All grades must be upper case A B C D or F.n";
    // Get the grade
    {
        for(int i = 0; i < numberOfGrades; i++)
        {
            cout << "Input a grade: ";
            cin >> userLetters[i];
        }
    }
    // Output the number in each category
    cout << "Number of A: " << gradeNumbersA << endl;
    cout << "Number of B: " << gradeNumbersB << endl;
    cout << "Number of C: " << gradeNumbersC << endl;
    cout << "Number of D: " << gradeNumbersD << endl;
    cout << "Number of F: " << gradeNumbersF << endl;
    return 0;
}
double countGrade(char letterCategory, int size, char array)
{
    for(int count = 0; count < 5; count++)
    {
        int a = 0, b = 0, c = 0, d = 0, f = 0;
        switch(array)
        {
        case 'A':
            a++;
            return a;
            break;
        case 'B':
            b++;
            return b;
            break;
        case 'C':
            c++;
            return c;
            break;
        case 'D':
            d++;
            return d;
            break;
        case 'F':
            f++;
            return f;
            break;
        }
    }
}

我很难弄清楚这一点。我不太确定如何在主函数中调用 countGrade 函数。我知道我在这个程序的其他地方搞砸了，但我真的很感激这方面的帮助。

你不需要 switch 语句。只需将数组元素中的等级与参数中的等级进行比较即可。在函数结束之前，您不应该返回总计。一旦你达到一个年级，你就会回到循环中，所以你停止循环。

int countGrade(char letterCategory, int size, char array[]) {
    int total = 0;
    for (int count = 0; count < size; count++) {
        if (array[count] == letterCategory) {
            total++;
        }
    }
    return total;
}

那么在main()中，你只需要做：

int numberOfGradesA = countGrade('A', numberOfGrades, userLetters);

其他年级也是如此。

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