Question

我创建了一个动态分配的2d数组，当我尝试将其删除时，根据该数组的尺寸会出现错误。

如果行多于列，则没有问题：

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

int main(){

    int num_rows = 8;
    int num_cols = 6;

    char **charBoard = new char*[num_rows+1];
    for(int i = 0; i<=num_cols; i++){
        charBoard[i] = new char[num_cols+1];
    }

    for (int i = 0; i <=num_rows; i++){
        delete[] charBoard[i];

    }   
    //free the main array
    delete[] charBoard;

return 0;   
}

如果列多于行，则会出现错误：

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

int main(){

    int num_rows = 4;
    int num_cols = 6;

    char **charBoard = new char*[num_rows+1];
    for(int i = 0; i<=num_cols; i++){
        charBoard[i] = new char[num_cols+1];
    }

    for (int i = 0; i <=num_rows; i++){
        delete[] charBoard[i];

    }   
    //free the main array
    delete[] charBoard;

return 0;   
}

然后我得到这个错误：中止（核心已弃用）

我不知道为什么。我是否删除了不正确的内容？

Answer 1

填充数组时，您在变量名称上输入了错误：

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

int main() {
    int num_rows = 4;
    int num_cols = 6;

    char **charBoard = new char*[num_rows+1];
    for(int i = 0; i <= num_cols; i++) {
                        ^^^^^^^^^
        charBoard[i] = new char[num_cols+1];
    }

    for (int i = 0; i <= num_rows; i++) {
                         ^^^^^^^^^
        delete[] charBoard[i];
    }   
    //free the main array
    delete[] charBoard;

    return 0;   
}

这是该代码的更正版本：

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

int main() {
    int num_rows = 4;
    int num_cols = 6;

    char **charBoard = new char*[num_rows+1];
    for(int i = 0; i <= num_rows; i++) {
        charBoard[i] = new char[num_cols+1];
    }

    for (int i = 0; i <= num_rows; i++) {
        delete[] charBoard[i];
    }   
    //free the main array
    delete[] charBoard;

    return 0;   
}

取消分配矩形2d数组会因尺寸而产生错误

1 个答案: