我想將紅色圈內(nèi)的部分都輸出成空格，代碼應(yīng)該怎么改啊。（要求一個數(shù)字占3個字符）#include<stdio.h> int?main() { char?a[9][9]; int?i,j,n,count=1; scanf("%d",&n); for(i=0,j=0;j<n-1;j++) { a[i][j]=count; count++; } for(i=0,j=n-1;i<n-1;i++) { a[i][j]=count; count++; } for(i=n-1,j=n-1;j>0;j--) { a[i][j]=count; count++; } for(i=n-1,j=0;i>0;i--) { a[i][j]=count; count++; } for(i=0;i<n;i++) { for(j=0;j<n;j++) { ????if(i<n-1&&i>0&&j<n-1&&j>0) ????a[i][j]='\0'; printf("%3d",a[i][j]); if(j==n-1) printf("\n"); } } return?0; ?}