C ++：单位化变量垃圾 [英] C++: Unitialized variables garbage

问题描述

  int myInt; 
 cout<< myInt; //像429948之类的垃圾等
  

如果我在C ++中输出和/

• 来自最后一个用户的内存中的实际值？

例如：程序A关闭，它有一个int 1234 在 0x1234 - >我运行我的程序， myInt 获取地址 0x1234 > 1234

• 是否只是随机垃圾？

不在随机 - 即绝对任意的垃圾，甚至没有任何保证随机性 - 编译器和运行时系统允许有绝对的任何东西（一些系统可能总是给零，其他可能给出任意不同的值，等等）。

int myInt;
cout << myInt; // Garbage like 429948, etc

If I output and/or work with unitialized variables in C++, what are their assumed values?

• Actual values in the memory from the "last user"?

e.g.: Program A is closed, it had an int with the value 1234 at 0x1234 -> I run my program, myInt gets the address 0x1234, I output it like above -> 1234

• Is it just random garbage?

解决方案

"Random garbage" but with emphasis on "garbage", not on "random" -- i.e., absolutely arbitrary garbage without even any guarantee of "randomness" -- the compiler and runtime systems are allowed to have absolutely anything there (some systems may always give zeros, other might give arbitrary different values, etc, etc).

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