#include<stdio.h>
#define N 15
main()
{
int i,j,row,cloum,size,square[N][N],count;
clrscr();
printf("please enter the square size(odd && <=15):\n");
scanf("%d",&size);
while(size%2==0||size>15||size<3)
{
printf("error due to the wrng input!please input it again!\n");
scanf("%d",&size);
}
for(i=0;i<size;i++)
  for(j=0;j<size;j++)
  square[i][j]=0;
i=0;j=(size-1)/2;
square[i][j]=1;
for(count=2;count<=size*size;count++)
{
row=i-1<0?(size-1):(i-1);
cloum=j-1<0?(size-1):(j-1);
if(square[row][cloum])
i=(++i)%size;
else
{i=row;
j=j-1<0?(size-1):(j-1);
}
square[i][j]=count;
}
printf("the %d square is:\n",size);
for(i=0;i<size;i++)
  {
for(j=0;j<size;j++)
printf("%d",square[i][j]);
printf("\n");
}
}

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