剑指offer面试题20：顺时针打印矩阵

#include <iostream>

using namespace std;

void PrintCircle(int numbers[4][4], int columns, int rows, int start) {
int endcol = columns - start - 1;
int endrow = rows - start - 1;
for (int i = start; i <= endcol; i++)
cout << numbers[start][i] << " ";
for (int i = start + 1; i <= endrow; i++)
cout << numbers[i][endcol] << " ";
for (int i = endcol - 1; i >= start; i--)
cout << numbers[endrow][i] << " ";
for (int i = endrow - 1; i >= start + 1; i--)
cout << numbers[i][start] << " ";
}

void PrintMatrix(int numbers[4][4], int columns, int rows) {
if (numbers == NULL || columns <= 0 || rows <= 0)
return;
int start = 0;
while (columns > start * 2 && rows > start * 2) {
PrintCircle(numbers, columns, rows, start);
++start;
}
}

int main() {
int number[4][4] = {
{1, 2, 3, 4}, {12, 13, 14, 5}, {11, 16, 15, 6}, {10, 9, 8, 7}};

PrintMatrix(number, 4, 4);
cout << endl;
return 0;
}