*
                      ***
                     *****
                    *******
                     *****
                      ***
                       *

*   
                      ***
                     *****
                    *******
                     *****
                      ***
                       *

第一个*号在中间

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不好意思,发错了

#include<stdio.h>
void main()
{
  int i,j,k,n;
  printf("请输入一个数");
  scanf("%d",&n);
  for(i=1;i<=n;i++)
     {
      for(j=i;j<=n;j++)
          printf(" ");
      for(k=1;k<=i*2-1;k++)
           printf("*");
     printf("\n");
    }
  for(i=1;i<=n-1;i++)
  {
      for(j=0;j<=i;j++)
          printf(" ");
      for(k=1;k<=2*(n-i)-1;k++)
          printf("*");
      printf("\n");
  
  
  }
}                    这样写好 理解