C++课后作业 30. 输入输出流课堂练习：美丽的蛇形方阵

• • 原题题目
  • 代码实现
  • 提交结果

#include 
#include 
#define X 10
using namespace std;

int main() {
  int n;
  cin >> n;
  int matrix[X][X];

  int low = 0, up = n - 1;
  int left = 0, right = n - 1;
  int num = 0, finalnum = n * n;

  while (1) {
    for (int i = left; i <= right; ++i) {
      matrix[low][i] = ++num;
    }
    if (num >= finalnum) break;

    for (int i = low + 1; i <= up; ++i) {
      matrix[i][right] = ++num;
    }
    if (num >= finalnum) break;

    for (int i = right - 1; i >= left; --i) {
      matrix[up][i] = ++num;
    }
    if (num >= finalnum) break;

    for (int i = up - 1; i >= low + 1; --i) {
      matrix[i][left] = ++num;
    }

    ++low;--up;
    ++left;--right;
  }

  for (int i = 0; i < n; ++i) {
    for (int j = 0; j < n; ++j) {
      cout << setw(4) << setfill('*') << matrix[i][j];
    }
    cout << endl;
  }

  return 0;
}