C语言：使用malloc开辟一个3*4的二维数组，并将内容初始化为1-12.

#include<stdio.h>
#include<stdlib.h>
int main()
{
    int(*p)[4] = (int (*)[4])malloc(12 * sizeof(int));//数组指针
     
    for (int i = 0; i < 3; i++)
    {
        for (int j = 0; j < 4; j++)
        {
            *(*(p + i) +j) = i * 4 + j + 1 ;
        }
    }
     
    for ( i = 0; i < 3; i++)
    {
        for (j = 0; j < 4; j++)
        {
            printf("%d\t", *(*(p + i) + j));
        }
    }
     
    printf("\n");
    system("pause");
    return 0;
}

#include<stdio.h>
#include<stdlib.h>
int main()
{
    int i = 0;
    int j = 0;
    int **p = (int **)malloc(3 * sizeof(int));
    for (i = 0; i < 3; i++)
    {
        *(p + i) = (int *)malloc(4 * sizeof(int));
    }
    for (i = 0; i < 3; i++)
    {
        for (j = 0; j < 4; j++)
        {
            p[i][j] = 4 * i + j + 1;
        }
    }
     
    for (i = 0; i < 3; i++)
    {
        for (j = 0; j < 4; j++)
        {
            printf("%d ", *(*(p + i) + j));
        }
         
    }
    system("pause");
    return 0;
}