【二维数组行和列的元素互换（矩阵的转置）】
1 2 3 4 5 6 | int a[3][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[3][4]={{1},{5},{9}}; 等价于 int a[3][4]={{1,0,0,0},{5,0,0,0}, {9,0,0,0}}; int a[3][4]={{1},{5,6}}; 等价于 int a[3][4]={{1},{5,6},{0}}; int a[3][4]={1,2,3,4,5,6,7,8,9,10,11,12}; 等价于：int a[ ][4]={1,2,3,4,5,6,7,8,9,10,11,12}; int a[][4]={{0,0,3},{ },{0,10}};合法 |
