C++ 将二维数组传递给函数 [英] c++ passing 2d arrays to funcions

问题描述

我知道我的代码还没有完成，但我并不要求它完成.它应该输入3只猴子一个星期吃的食物和其他东西.但我遇到了障碍.当我将 cin 放入磅Eaten函数时，它给了我一个错误(错误:没有运算符<<"匹配这些操作数).我没有正确传递数组是因为它不起作用吗?感谢您的帮助

I know my code isnt finished yet im not asking for it to be done. It's supposed to input food eaten by 3 monkeys over a week and other stuff. But I've hit a snag. It gives me an error(Error: no operator "<<" matches these operands) when i put the cin in the poundsEaten function. Am I not passing the array right is that why it isnt working? Thanks for any help

#include <iomanip>
#include <iostream>
using namespace std;

//Global Constants
const int NUM_MONKEYS = 3;
const int DAYS = 7;

//Prototypes
void poundsEaten(const double[][DAYS],int, int);
void averageEaten();
void least();
void most();

int main()
{
    //const int NUM_MONKEYS = 3;
    //const int DAYS = 7;
    double foodEaten[NUM_MONKEYS][DAYS]; //Array with 3 rows, 7 columns

    poundsEaten(foodEaten, NUM_MONKEYS, DAYS);

    system("pause");
    return 0;
}

void poundsEaten(const double array[][DAYS], int rows, int cols)
{
    for(int index = 0; index < rows; index++)
    {
        for(int count = 0; count < DAYS; count++)
        {
            cout << "Pounds of food eaten on day " << (index + 1);
            cout << " by monkey " << (count + 1);
            cin >> array[index][count];
            // Here is where i get the error
        }
    } 
}

推荐答案

您声明:

const double array[][DAYS],

然而，在poundsEaten 函数中，你要求用户输入信息来填充array，这意味着array 不是const，因此，错误.从参数中删除 const 限定符，以便用户输入可以更改 array.

however, inside poundsEaten function, you are asking user to input information to fill in the array, which means the array is not const, therefore, error. Remove the const qualifier from the parameter such that the array can be changed by user input.

void poundsEaten(double array[][DAYS], int rows, int cols)

顺便说一句:不要使用 array 作为数组的变量名，使用其他一些名称以获得良好的实践.同时，cols 未在您的 poundsEaten 函数中使用.

BTW: don't use array as variable name for an array, use some other names for good practice. Meanwhile,cols is not used inside your poundsEaten function.

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