“*”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。

 1 //date:2013/8/14
 2 //designer :pengxiaoen
 3 //function: just for fun
 4 
 5 #include "stdio.h"
 6 #include "math.h"
 7 int main ()
 8 {
 9   int i,j,k,r;
10   int t,temp1,temp2;
11 //-------------------------------------------------------------  
12   printf ("please enter a odd number between  3  and 30 : ");
13   scanf("%d",&r);
14   while ((r<3) || (r>30) || ((r+1)%2)  )
15   {
16      printf("
 error 

");
17      printf ("please enter a odd number between  3  and 30 : ");
18      scanf("%d",&r);
19   }
20 
21   t = (r-1)/2;
22    temp1 = t+1;
23 //--------------------------------------------------------------  
24   for(i=0; i<r;i++)
25   {    
26      temp1--;
27      for(j=0; j<=abs(temp1);j++)   printf(" ");                         
28      
29      if(i<=t) temp2 = 2*i+1;
30      else temp2 = 2*(r-i)-1;
31      for(k=0; k<temp2;k++)   printf("*");
32      
33      printf("
"); 
34      
35   }
36   system("pause");
37 }

执行结果