# include <stdio.h>
# include <stdlib.h>
int main()
{
    void fun(int **p, int x, int y)
    {
        int i, j;
        p = (int **)malloc(x * sizeof(int *));
        for (i = 0; i < x; i++)
        {
            p[i] = (int *)malloc(y * sizeof(int));
            for (j = 0; j < y; j++)
            {
                p[i][j] = i+j;
                printf("%5d",p[i][j]);
            }
        }
    }
    void funs(int **p, int x)
    {
        int i, j;
        for (i = 0; i < x; i++)
        {
            
            free(p[i]);
            pArr[i] = 0;   
        }
        free(p);
        p = 0;
    }
    int **p=NULL;
    fun(p,4,5);
    funs(p,4);
    return 0;
}

我明白了，但是修改后还是有问题啊，（funs函数有问题），求纠错！
代码如下：

# include <stdio.h>
# include <stdlib.h>
void fun(int **p, int x, int y)
{
    int i, j;
    p = (int **)malloc(x * sizeof(int *));
    for (i = 0; i < x; i++)
    {
        p[i] = (int *)malloc(y * sizeof(int));
        for (j = 0; j < y; j++)
        {
            p[i][j] = i+j;
            printf("%5d",p[i][j]);
        }
    }
}
void funs(int **p, int x)
{
    int i;
    for (i = 0; i < x; i++)
    {
        free(p[i]);
        p[i] = NULL;   
    }
    free(p);
    p =NULL;
}
int main()
{
    int **p=NULL;
    fun(p,4,5);
    funs(p,4);
    return 0;
}