ch19-5.c

C语言程序设计上机指导与练习 冶金工业出版社 刘怀亮

#include<stdio.h>
main()
{
   int m,n,i;
   void out();
   printf("Enter length: ");
   scanf("%d",&n);
   for(i=n-1;i>=-n+1;i--)
   {
      m=(i>0)?i:-i;
      out(m, ' ');
      if(i==n-1 || i==-n+1)
      {
         out(n, '*');
         out(1, '\n');
      }
      else
      {
         out(1, '*');
         out(3*n-2*m-4, ' ');
         out(1, '*');
         out(1, '\n');
      }
   }
}
void out(n,ch)
int n;
char ch;
{
   while(n-->0)
      printf("%c",ch);
}