题目：顺时针打印矩阵
void printnumber(int x)
{
cout << x << " " ;
}
void PrintMatrixInCircle(int (*num)[4], int cols , int rows, int start)
{
int endx = cols - 1 - start;
int endy = rows - 1 - start;
//从左到右打印一行
for (int i = start; i <= endx; ++i)
{
int number = num [start][i];
printnumber(number);
}
//从上到下打印一列
if (start < endy)
{
for (int i = start + 1; i <= endy; ++i)
{
int number = num [i][endx];
printnumber(number);
}
}
//从右到左打印一行
if (start < endx&&start < endy)
{
for (int i = endx - 1; i >= start; --i)
{
int number = num [endy][i];
printnumber(number);
}
}
//从下到上打印一行
if (start < endx&&start<endy-1)
{
for (int i = endy - 1; i >= start + 1; --i)
{
int number = num [i][start];
printnumber(number);
}
}
}
void PrintMatrixClockwisely(int (*num)[4], int cols , int rows)
{
if (num == NULL || cols <= 0 || rows <= 0)
return;
int start = 0;
while (cols > start * 2 && rows > start * 2)
{
PrintMatrixInCircle( num, cols , rows, start);
++start;
}
}
