++,++的问题扯淡

[开心的卡夫卡]

#include "stdafx.h"

void main() 
{ 
	int a,b,i=3,j=3; 
	a=(i++)+(i++)+(i++); 
	b=(++j)+(++j)+(++j); 
	printf("a=%d,b=%d,i=%d,j=%d\n",a,b,i,j); 
         i = 3;
	j = 3;
	a =i+++i+++i++; 
	b=(++j)+++j+++j; 
	printf("a=%d,b=%d,i=%d,j=%d\n",a,b,i,j); 
} 

其实不怎么实用,不过有时间,大家帮忙透彻一下吧

[机智的呆呆]

其实根据优先级和编译器对这种文法的解析方式，是有规律可循的~~~

[珍惜生命远离CPP]

未定义行为,别浪费时间研究了

[mstlq]

http://www.titilima.cn/show-234-1.html

[jixingzhong]

未定义行为，将依赖于环境

[ypb362148418]

由编译器决定的，最近貌似有很多问这样的帖子

[珍惜生命远离CPP]

[Quote=引用 5 楼 ypb362148418 的回复:]
由编译器决定的，最近貌似有很多问这样的帖子
[/Quote]
快到考试时间了。考试就喜欢考这些东西。

[a1000004176]

研究这些东西没意思~

[sunnypchen]

[Quote=引用 7 楼 a1000004176 的回复:]
研究这些东西没意思~
[/Quote]
华为09年的校园招聘中就出过五道这样的笔试题。。。

[yang677888]

看看 帮顶

[KingWolfOfSky]

void main() 
{ 
002C13A0  push        ebp  
002C13A1  mov         ebp,esp 
002C13A3  sub         esp,0F0h 
002C13A9  push        ebx  
002C13AA  push        esi  
002C13AB  push        edi  
002C13AC  lea         edi,[ebp-0F0h] 
002C13B2  mov         ecx,3Ch 
002C13B7  mov         eax,0CCCCCCCCh 
002C13BC  rep stos    dword ptr es:[edi] 
    int a,b,i=3,j=3; 
002C13BE  mov         dword ptr [i],3 
002C13C5  mov         dword ptr [j],3 
    a=(i++)+(i++)+(i++); 
002C13CC  mov         eax,dword ptr [i] 
002C13CF  add         eax,dword ptr [i] 
002C13D2  add         eax,dword ptr [i] 
002C13D5  mov         dword ptr [a],eax 
002C13D8  mov         ecx,dword ptr [i] 
002C13DB  add         ecx,1 
002C13DE  mov         dword ptr [i],ecx 
002C13E1  mov         edx,dword ptr [i] 
002C13E4  add         edx,1 
002C13E7  mov         dword ptr [i],edx 
002C13EA  mov         eax,dword ptr [i] 
002C13ED  add         eax,1 
002C13F0  mov         dword ptr [i],eax 
    b=(++j)+(++j)+(++j); 
002C13F3  mov         eax,dword ptr [j] 
002C13F6  add         eax,1 
002C13F9  mov         dword ptr [j],eax 
002C13FC  mov         ecx,dword ptr [j] 
002C13FF  add         ecx,1 
002C1402  mov         dword ptr [j],ecx 
002C1405  mov         edx,dword ptr [j] 
002C1408  add         edx,1 
002C140B  mov         dword ptr [j],edx 
002C140E  mov         eax,dword ptr [j] 
002C1411  add         eax,dword ptr [j] 
002C1414  add         eax,dword ptr [j] 
002C1417  mov         dword ptr [b],eax 
    printf("a=%d,b=%d,i=%d,j=%d\n",a,b,i,j); 
002C141A  mov         esi,esp 
002C141C  mov         eax,dword ptr [j] 
002C141F  push        eax  
002C1420  mov         ecx,dword ptr [i] 
002C1423  push        ecx  
002C1424  mov         edx,dword ptr [b] 
002C1427  push        edx  
002C1428  mov         eax,dword ptr [a] 
002C142B  push        eax  
002C142C  push        offset string "a=%d,b=%d,i=%d,j=%d\n" (2C573Ch) 
002C1431  call        dword ptr [__imp__printf (2C82BCh)] 
002C1437  add         esp,14h 
002C143A  cmp         esi,esp 
002C143C  call        @ILT+310(__RTC_CheckEsp) (2C113Bh) 
         i = 3;
002C1441  mov         dword ptr [i],3 
    j = 3;
002C1448  mov         dword ptr [j],3 
    a =i+++i+++i++; 
002C144F  mov         eax,dword ptr [i] 
002C1452  add         eax,dword ptr [i] 
002C1455  add         eax,dword ptr [i] 
002C1458  mov         dword ptr [a],eax 
002C145B  mov         ecx,dword ptr [i] 
002C145E  add         ecx,1 
002C1461  mov         dword ptr [i],ecx 
002C1464  mov         edx,dword ptr [i] 
002C1467  add         edx,1 
002C146A  mov         dword ptr [i],edx 
002C146D  mov         eax,dword ptr [i] 
002C1470  add         eax,1 
002C1473  mov         dword ptr [i],eax 
    b=(++j)+++j+++j; 
002C1476  mov         eax,dword ptr [j] 
002C1479  add         eax,1 
002C147C  mov         dword ptr [j],eax 
002C147F  mov         ecx,dword ptr [j] 
002C1482  add         ecx,dword ptr [j] 
002C1485  add         ecx,dword ptr [j] 
002C1488  mov         dword ptr [b],ecx 
002C148B  mov         edx,dword ptr [j] 
002C148E  add         edx,1 
002C1491  mov         dword ptr [j],edx 
002C1494  mov         eax,dword ptr [j] 
002C1497  add         eax,1 
002C149A  mov         dword ptr [j],eax 
    printf("a=%d,b=%d,i=%d,j=%d\n",a,b,i,j); 
002C149D  mov         esi,esp 
002C149F  mov         eax,dword ptr [j] 
002C14A2  push        eax  
002C14A3  mov         ecx,dword ptr [i] 
002C14A6  push        ecx  
002C14A7  mov         edx,dword ptr [b] 
002C14AA  push        edx  
002C14AB  mov         eax,dword ptr [a] 
002C14AE  push        eax  
002C14AF  push        offset string "a=%d,b=%d,i=%d,j=%d\n" (2C573Ch) 
002C14B4  call        dword ptr [__imp__printf (2C82BCh)] 
002C14BA  add         esp,14h 
002C14BD  cmp         esi,esp 
002C14BF  call        @ILT+310(__RTC_CheckEsp) (2C113Bh) 
} 

[sunnypchen]

我想了一个多小时，越想越晕。。。

[macrojj]

我根本不在乎 这个题