C 释放2D结构中分配的内存

嗨，我有下面的代码，我在100x250结构数组中分配内存。使用后，我想释放内存，但我无法找到一种方法

/*trial programe for storing sample data for each beam of each ping*/

#include <stdio.h>
#include <math.h>
typedef struct{ // in this structure we will define the pointers. so just data type and variable.
    int count;
    float *samples;
    float *deTVG_BS;
} card;

main()
{
    //float a,*p;
    int i,j,k,l,m,variable;
    l=100;
    m=250;
    variable=10;
    card acard[l][m]; 
    //printf("size of acard before memory allocation is %d\n",sizeof(acard));


    /* now we will alocote memory for all the pointers we have defined in structure.
     * The memory size can be different for each pointer. 
     * In our case memory size will depends on number of samples for each beam.
     *   * */

    for(i=0;i<l;i++) // i is number of profiles
        {
            for (j=0;j<m;j++) // j is number of beam
                {
                    acard[i][j].count=variable; //from 1 to 400;
                    acard[i][j].samples=(float*)calloc(acard[i][j].count,sizeof(float));
                    acard[i][j].deTVG_BS=(float*)calloc(acard[i][j].count,sizeof(float));

                    for(k=0;k<acard[i][j].count;k++)
                        {
                            acard[i][j].samples[k]=k*1.0;// in reality will be different values
                            acard[i][j].deTVG_BS[k]=k*100.0; // in reality will be different values
                        }
                }
                printf("allocated memeory for profile %d\n",i);
        }

    for(i=0;i<l;i++) // i is number of profiles
        {
            for (j=0;j<m;j++) 
            {
                void free(acard[i][j].samples);
                void free(acard[i][j].deTVG_BS);

            }
        }

    void free(acard);
}

我不确定是应该运行最后一个for循环，还是仅仅使用freeacard就足够了

事先非常感谢你。

---

Anand

无论您在哪里调用calloc并存储返回值，都需要在使用完该值后调用free。一般来说，只需按分配的相反顺序释放物品，就可以省去很多麻烦

为此，看起来您需要像当前一样对每个acard[i][j]进行迭代和2次释放

您不需要在acard上调用free，但是因为这是一个堆栈变量，实际上我希望在尝试释放您没有使用malloc/calloc/etc分配的内容时断言/崩溃