#include <stdio.h>

   int x ,y;

int main(void)
{
  int x =8;

   if((1<x)&&(x>=20))
    {
       y=x;
     }

     printf("\n打印y:",y );




        system("PAUSE");
      return 0;
}

输出的结果是：打印Y：请按任意键继续
 为什么会这样?

谢谢。我试了，不过还是一样的结果。不知道哪出了问题，实在找不到。

不对啊。这样打印出来的是0，和我的题目对不起来。我x=8，按题目应该打印的是8，而不是0
  而且if应该是((1>x)&&(x<=20))这样啊。。找个事答案里面的。不过答案太简单了。

y赋值为0的时候，只能输出0；
  

按你这样编译的时候提示有错误
In file included from C:\DEV-C_~1\Include\windows.h:78,
                 from e:\c\4112练~1.c:2:
C:\DEV-C_~1\Include\windef.h:153: parse error before `#'
C:\DEV-C_~1\Include\windef.h:153: warning: data definition has no type or storage class
C:\DEV-C_~1\Include\windef.h:154: parse error before `#'
C:\DEV-C_~1\Include\windef.h:154: warning: data definition has no type or storage class
C:\DEV-C_~1\Include\windef.h:155: parse error before `#'
C:\DEV-C_~1\Include\windef.h:155: warning: data definition has no type or storage class
C:\DEV-C_~1\Include\windef.h:156: parse error before `#'
C:\DEV-C_~1\Include\windef.h:156: warning: data definition has no type or storage class
C:\DEV-C_~1\Include\windef.h:157: parse error before `#'
C:\DEV-C_~1\Include\windef.h:157: warning: data definition has no type or storage class
C:\DEV-C_~1\Include\windef.h:158: parse error before `#'
C:\DEV-C_~1\Include\windef.h:158: warning: data definition has no type or storage class
C:\DEV-C_~1\Include\windef.h:159: parse error before `#'
C:\DEV-C_~1\Include\windef.h:159: warning: data definition has no type or storage class
C:\DEV-C_~1\Include\windef.h:160: parse error before `#'
C:\DEV-C_~1\Include\windef.h:160: warning: data definition has no type or storage class
C:\DEV-C_~1\Include\windef.h:161: parse error before `#'
C:\DEV-C_~1\Include\windef.h:161: warning: data definition has no type or storage class
C:\DEV-C_~1\Include\windef.h:162: parse error before `#'
C:\DEV-C_~1\Include\windef.h:162: warning: data definition has no type or storage class
C:\DEV-C_~1\Include\windef.h:163: parse error before `#'
C:\DEV-C_~1\Include\windef.h:163: warning: data definition has no type or storage class
C:\DEV-C_~1\Include\windef.h:164: parse error before `*'
C:\DEV-C_~1\Include\windef.h:164: warning: data definition has no type or storage class
C:\DEV-C_~1\Include\windef.h:165: parse error before `#'
C:\DEV-C_~1\Include\windef.h:165: warning: data definition has no type or storage class
C:\DEV-C_~1\Include\windef.h:166: parse error before `#'
C:\DEV-C_~1\Include\windef.h:166: warning: data definition has no type or storage class
C:\DEV-C_~1\Include\windef.h:167: parse error before `#'
C:\DEV-C_~1\Include\windef.h:167: warning: data definition has no type or storage class
C:\DEV-C_~1\Include\windef.h:168: parse error before `HMODULE'
C:\DEV-C_~1\Include\windef.h:168: warning: data definition has no type or storage class
C:\DEV-C_~1\Include\windef.h:169: parse error before `#'
C:\DEV-C_~1\Include\windef.h:169: warning: data definition has no type or storage class
C:\DEV-C_~1\Include\windef.h:170: parse error before `#'
C:\DEV-C_~1\Include\windef.h:170: warning: data definition has no type or storage class
C:\DEV-C_~1\Include\windef.h:171: parse error before `#'
C:\DEV-C_~1\Include\windef.h:171: warning: data definition has no type or storage class
C:\DEV-C_~1\Include\windef.h:172: parse error before `#'
C:\DEV-C_~1\Include\windef.h:172: warning: data definition has no type or storage class
C:\DEV-C_~1\Include\windef.h:173: parse error before `#'
C:\DEV-C_~1\Include\windef.h:173: warning: data definition has no type or storage class
C:\DEV-C_~1\Include\windef.h:174: parse error before `#'

多谢了哦。。就是你说的这样。哈。终于解决了。。

不好意思刚说错了。。是10楼的帮我解决的。。他的这个输出的是对的。。

谢谢了。。你的那个思路好像也是对的。我等下去试试。不过我是用Dev-C++  编译的。可能#include<windows.h>这个不能用吧。

我好像就是 if((1<x)&&(x>=20))
这里写错了。。 if((1<x)&&(<=20))  难怪找半天找不到问题。