a=a+(a++);b=b+(++b);计算顺序，反汇编

    a=a+(a++);
013913BC  mov         eax,dword ptr [a]  
013913BF  add         eax,dword ptr [a]  
013913C2  mov         dword ptr [a],eax  
013913C5  mov         ecx,dword ptr [a]  
013913C8  add         ecx,1  
013913CB  mov         dword ptr [a],ecx  

    b=b+(++b);
013913CE  mov         eax,dword ptr [b]  
013913D1  add         eax,1  
013913D4  mov         dword ptr [b],eax  
013913D7  mov         ecx,dword ptr [b]  
013913DA  add         ecx,dword ptr [b]  
013913DD  mov         dword ptr [b],ecx