C ++:未初始化的变量垃圾 [英] C++: Uninitialized variables garbage

问题描述

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

如果我在C ++中输出和/或使用未初始化的变量，它们的假定值是什么?

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

• 最后一个用户"在内存中的实际值?

例如:程序A已关闭，它在0x1234处具有一个值为1234的整数->运行我的程序，myInt获取地址0x1234，我像上面一样输出它-> 1234

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

• 这只是随机垃圾吗?

推荐答案

随机垃圾"，但强调垃圾"，不强调随机"–即，绝对任意的垃圾，甚至不能保证随机性"–允许编译器和运行时系统在其中具有绝对的任何内容(某些系统可能始终提供零，其他系统可能提供任意不同的值，依此类推，等等).

"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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