Same code, different output in C# and C++ -

c#:

using system; using system.collections.generic; using system.linq; using system.text;  namespace consoleapplication1 {     class program     {         static void main(string[] args)         {             int = 11;             int b = 2;             -= b -= -= b += b -= a;             system.console.writeline(a);         }     } } 

output:27

c++:

#include "stdafx.h" #include<iostream>  int _tmain(int argc, _tchar* argv[]) {        int = 11;        int b = 2;        -= b -= -= b += b -= a;        std::cout<<a<<std::endl;        return 0; } 

output:76

same code has differernt output, can tell why ? appreciated!!

in c# code defined , equivalent following:

a = - (b = b - (a = - (b = b + (b = b - a)))); 

the innermost assignments not relevant here because assigned value never used before variable reassigned. code has same effect:

a = - (b = b - (a - (b + (b - a)))); 

this same as:

a = - (b = (b * 3) - (a * 2)); 

or simpler:

b = (b * 3) - (a * 2); -= b; 

however, in c++ code gives undefined behaviour. there no guarantee @ do.