程序代码：

#include <stdio.h>
#define MIN(a, b) ((a) < (b) ? a : b)

int min4(int a, int b, int c, int d) {
   int min = 0;
   min = MIN(a, b);
   min = MIN(min, c);
   min = MIN(min, d);
   return min;
}

int main(void) {
   int top, left, bottom, right, width, i, j;
   scanf("%d", &width);
   for (i = 0; i < width; ++i) {
      for (j = 0; j < width; ++j) {
         top    = i + 1;
         left   = j + 1;
         bottom = width - i;
         right  = width - j;
         printf("%-3d", min4(top, left, bottom, right));
      }
      printf("\n");
   }
   return 0;
}

程序代码：

#include<stdio.h>
int f(int row, int col, int n)
{
    if(n - row - 1 < row) row = n - row - 1;
    if(n - col - 1 < col) col = n - col - 1;
    return ((row < col) ? row : col)+1 ;
}
int main()
{
    int i, j, n;
    scanf("%d", &n);
    for(i = 0; i < n; i++, putchar('\n'))
    for(j = 0; j < n; j++)
        printf("%4d", f(i, j, n));
    return 0;
}