功能动态内存分配 [英] Function for Dynamic Memory allocation

问题描述

int **Matrix_B1;  

Matrix_B1 = (int**)malloc(RowB*(sizeof(int*)));  

for (int p=0; p<RowB; p++)  
{  
    Matrix_B1[p] = (int*)malloc(ColumnB*(sizeof(int)));   
}

我如何创建一个函数来在C执行动态内存分配？

How do I create a function to perform dynamic memory allocation in c ?

我有很多这样的矩阵，我不想要保持写同样的事情。

I have lots of matrices like this and I don't want to keep writing the same thing.

推荐答案

只需使用功能，你通常会。还要记住的尺寸。还记得释放时，你就大功告成了！

Just use functions as you would normally. Remember to keep track of the dimensions. Also remember to free when you're done!

#include <stdlib.h>

int **Create2x2Matrix(int rowB, int columnB)
{
    int **matrix = (int**)malloc(rowB*(sizeof(int*)));
    for (int p=0; p<rowB; p++)  
    {  
        matrix[p] = (int*)malloc(columnB*(sizeof(int)));   
    }
    return matrix;
}

void Destroy2x2Matrix(int **matrix, int rowB)
{
    for (int p=0; p<rowB; p++)  
    {  
        free(matrix[p]);
    }
    free(matrix);
}

int main()
{
    int rowB = 10;
    int columnB = 11;
    int **matrix_B1 = Create2x2Matrix(rowB, columnB);
    Destroy2x2Matrix(matrix_B1, rowB);
    return 0;
}

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