flag47 输出菱形

# include <stdio.h>
int main()
{
int i,j;
int mid,k=9;
mid=k/2;
for(i=0;i<=mid;i++)
{
for(j=0;j<k;j++)
{
if(j>=mid-i && j<=mid+i)//重点在这里
printf("*");
else 
printf(" ");
}
printf("\n");
}
for(i=mid-1;i>=0;i--)
{
for(j=0;j<k;j++)
{
if(j>=mid-i && j<=mid+i)
printf("*");
else 
printf(" ");
}
printf("\n");
}


}