一、二维整型数组1.二维数组定义类型说明符 数组名[行数][列数];int a[3][4]; //12 intfloat a[3][4]; //12 float2.二维数组的访问数组名[行下标][列下标];行下标0---》行数-1列下标0---》列数-13.二维数组的初始化全部初始化int a[3][4] {{1,2,3,4}, {5,6,7,8}, {9,10,11,12}};int a[][4] {{1,2,3,4}, {5,6,7,8}, {9,10,11,12}};int a[3][4] {1,2,3,4,5,6,7,8,9,10,11,12};int a[][4] {1,2,3,4,5,6,7,8,9,10,11,12};注意在二维数组有初始化值得情况下可以省略行数不能省略列数。局部初始化int a[3][4] {{1,2}, {5,6,7}, {9}};int a[3][4] {1,2,3,4,5,6,7,8};int a[][4] {1,2,3,4,5,6,7}; //2行4列未初始化数据按0存储。全部初始化为0int a[3][4] {0};int a[][4] {0}; //1行4列int a[2][3] {{1, 2, 3}, {4, 5, 6}}; sizeof(a); //bytes---6*4 24 sizeof(a[0][0]); //4 sizeof(a[0]); //4*3 12 计算行数 sizeof(a)/sizeof(a[0]); //2 ----行数 计算列数 sizeof(a[0])/sizeof(a[0][0]); //3 ---列数4.二维数组的存储方式单一性、有序性、连续性。二、二维字符型数组一维字符型数组保存一个字符串二维字符型数组保存多个字符串1.二维字符型数组定义char数组名[行数][列数];char str[3][100]; //sizeof(str) ---3*100 300字节2.二维字符型数组初始化char str[3][100] {0}; char str[3][100] {{hello}, {world}, {how}}; char str[3][100] {hello, world, how}; char str[3][100] {hello, world};3.二维字符型数组输入输出char str[3][100] {0}; for (int i 0; i 3; i) { gets(str[i]); } for (int i 0; i 3; i) { puts(str[i]); //printf(%s\n, str[i]); }