#include"stdio.h"
void main()
{
    int i,j,k;
    for(i=0;i<=20;i++)
    {        
        for(j=0;j<=19-i;j++)
        {
            printf(" ");
        }
            for(k=0;k<=2*i;k++)
            {
                printf("*");
            }
            printf("\n");
    }
    for(i=0;i<=18;i++)
    {
        for(j=0;j<=10;j++)
        {
            printf(" ");
        }
        for(k=0;k<=20;k++)
        {
            printf("*");
        }
        printf("\n");
    }
}

输出：



                    *
                   ***
                  *****
                 *******
                *********
               ***********
              *************
             ***************
            *****************
           *******************
          *********************
         ***********************
        *************************
       ***************************
      *****************************
     *******************************
    *********************************
   ***********************************
  *************************************
 ***************************************
*****************************************
           *********************
           *********************
           *********************
           *********************
           *********************
           *********************
           *********************
           *********************
           *********************
           *********************
           *********************
           *********************
           *********************
           *********************
           *********************
           *********************
           *********************
           *********************
           *********************
Press any key to continue

[[it] 本帖最后由 小小熊宝宝 于 2008-8-25 09:22 编辑 [/it]]