不知道如何处理错误“数组初始值设定项中的元素过多”

Question

In line 10 I cannot find out where my problem is at first. I place int a[100][100]={0} but the cpu speed is stuck.
Then, I try to change it into a[n][n] but no output is shown. Last, I try to change it again as if it resembles the original ones. However, nothing works instead of a new question.

#include<stdio.h>

int main() {
  int n;

  while (scanf("%d", &n)) {
    n *= 2;
    int x = 0, y = 0, num = 1;
    int a[n][n] = {0};
    a[x][y] = num++;
    while (n * n >= num) //定義陣列
    {
      while (y + 1 < n && !a[x][y + 1]) //向右
        a[x][++y] = num++;

      while (x + 1 < n && !a[x + 1][y]) //向下
        a[++x][y] = num++;

      while (y - 1 >= 0 && !a[x][y - 1]) //向左
        a[x][--y] = num++;

      while (x - 1 >= 0 && !a[x - 1][y]) //向上
        a[--x][y] = num++;
    }
    for (x = 0; x < n; x++) //print 陣列
        {
      for (y = 0; y < n; y++) {
        if (y != n - 1) {
          printf("%d ", a[x][y]);
        } else {
          printf("%d", a[x][y]);
        }
      }
      printf("\n");
    }

    break;
  }

  return 0;
}

Answer 1

At least this problem:

Variable Length Arrays ( VLA ) cannot be initialized via the C standard.

Alternate, assign via memset() after defining a .

// int a[n][n]={0};
int a[n][n];
memset(a, 0, sizeof a);