c ++错误：无效类型int int数组下标 [英] c++ error: invalid types int int for array subscript

问题描述

尝试学习C ++并尝试对数组进行简单的练习。

Trying to learn C++ and working through a simple exercise on arrays.

基本上，我创建了一个多维数组，我想创建一个打印出值的函数。

Basically, I've created a multidimensional array and I want to create a function that prints out the values.

Main（）中的注释for-loop工作正常，但是当我尝试将该for循环转换为函数时，它不起作用，对于我的生活，我看不出为什么。

The commented for-loop within Main() works fine, but when I try to turn that for-loop into a function, it doesn't work and for the life of me, I cannot see why.

#include <iostream>
using namespace std;


void printArray(int theArray[], int numberOfRows, int numberOfColumns);

int main()
{

    int sally[2][3] = {{2,3,4},{8,9,10}};

    printArray(sally,2,3);

//    for(int rows = 0; rows < 2; rows++){
//        for(int columns = 0; columns < 3; columns++){
//            cout << sally[rows][columns] << " ";
//        }
//        cout << endl;
//    }

}

void printArray(int theArray[], int numberOfRows, int numberOfColumns){
    for(int x = 0; x < numberOfRows; x++){
        for(int y = 0; y < numberOfColumns; y++){
            cout << theArray[x][y] << " ";
        }
        cout << endl;
    }
}

推荐答案

C ++从C继承其语法，并努力保持语法匹配的向后兼容性。所以传递数组就像C：长度信息丢失。

C++ inherits its syntax from C, and tries hard to maintain backward compatibility where the syntax matches. So passing arrays works just like C: the length information is lost.

然而，C ++提供了一种方法来自动传递长度信息，使用引用关系，C没有引用）：

However, C++ does provide a way to automatically pass the length information, using a reference (no backward compatibility concerns, C has no references):

template<int numberOfRows, int numberOfColumns>
void printArray(int (&theArray)[numberOfRows][numberOfColumns])
{
    for(int x = 0; x < numberOfRows; x++){
        for(int y = 0; y < numberOfColumns; y++){
            cout << theArray[x][y] << " ";
        }
        cout << endl;
    }
}

演示： http://ideone.com/MrYKz

这是一个避免复杂数组引用语法的变体： http://ideone.com/GVkxk

Here's a variation that avoids the complicated array reference syntax: http://ideone.com/GVkxk

如果大小是动态的，则不能使用任一模板版本。你只需要知道C和C ++以行为主的顺序存储数组内容。

If the size is dynamic, you can't use either template version. You just need to know that C and C++ store array content in row-major order.

可变大小的代码： http://ideone.com/kjHiR

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