认识二维数组

定义
数据类型 数组名 ［元素个数］［元素数组中元素个数］

int num［4］［5］
注意：二维数组其实就是一位数组，只不过元素是数组

初始化
int num [4][3] = {{…},{….},{…},{…}};

int [0]

include <stdio.h>

int main ()
{
//1、完全初始化
int num[4][3] = {{1,2,3},
{4,5,6},
{7,8,9},
{0,1,2}};

int loop1 = 0;
int loop2 = 0;

for (loop1 = 0; loop1 < 4; loop1++)
{
    for (loop2 = 0; loop2 < 3;loop2++)
    {
        printf("num[%d][%d]%d\n",loop1,loop2,num[loop1][loop2]);
    }
}
return 0;

}

打印
1 0 0 0 1
0 1 0 1 0
0 0 1 0 0
0 1 0 1 0
1 0 0 0 1

include <stdio.h>

int main ()
{
int num[5][5] = {0};

for (int i = 0; i < 5;i++)
{
    for (int j = 0; j < 5; j++)
    {
        if(i + j == 4 || i == j)
        {
         num[i][j] = 1;
        }
        printf("%-3d",num[i][j]);
    }
    printf("\n");
}
return 0;

}