“*”菱形打印程序

闲来无事，还记得以前课本上的那个课后习题，那就编个小程序玩玩。

//date:2013/8/14
//designer :pengxiaoen
//function: just for fun

#include "stdio.h"
#include "math.h"
int main ()
{
  int i,j,k,r;
  int t,temp1,temp2;
//-------------------------------------------------------------  
  printf ("please enter a odd number between  3  and 30 : ");
  scanf("%d",&r);
  while ((r<3) || (r>30) || ((r+1)%2)  )
  {
     printf("
 error 

");
     printf ("please enter a odd number between  3  and 30 : ");
     scanf("%d",&r);
  }

  t = (r-1)/2;
   temp1 = t+1;
//--------------------------------------------------------------  
  for(i=0; i<r;i++)
  {    
     temp1--;
     for(j=0; j<=abs(temp1);j++)   printf(" ");                         
     
     if(i<=t) temp2 = 2*i+1;
     else temp2 = 2*(r-i)-1;
     for(k=0; k<temp2;k++)   printf("*");
     
     printf("
"); 
     
  }
  system("pause");
}

执行结果