问题描述
以下内容来自在家填写"编程测试，该测试是英国大学游戏开发理学硕士课程申请过程的一部分:
The following is from a "fill-in at home" programming test that is part of the application process for an MSc in game development at a UK university:
如果程序声明了四个变量，则类型为 int ，类型之一 float ，一种类型为 char ，另一种类型为 bool ，该变量会占用内存中的最小空间?
If a program declared four variables, one of type int, one of type float, one of type char, and one of type bool, which variable would occupy the least space in memory?
- int
- char
- 浮动
- 布尔
根据说明，只有一个正确的陈述.但是，我的C ++书(C ++ Pocket Reference，O'Reilly)指出:"bool的典型大小是一个字节，"和"char的大小是一个字节.从技术上讲，字节的大小是实现定义的，但是几乎只有八位."
According to the instructions, there is only one true statement. However, my C++ book (C++ Pocket Reference, O'Reilly) states: "The typical size of a bool is one byte," and "The size of a char is one byte. The size of a byte technically is implementation defined, but it is rarely anything but eight bits."
我在这里误会了什么吗?您会回答什么，为什么?
Am I misunderstanding something here? What answer would you put and why?
推荐答案
没有任何类型比 char 少 ，因为根据定义， sizeof(char)==1 .但是，所有类型完全有可能占用相同数量的空间.
No type takes less than char, because by definition sizeof(char) == 1. However, it is entirely possible that all types take the same amount of space.
(用16位(用适当的异常浮点格式表示每种类型就足够满足标准值范围的要求；每种类型都有32位的实际硬件就存在).
(Representing each type with 16 bits (with a suitably unusual floating point format) would suffice to satisfy the standard value range requirements; real hardware where every type has 32 bits exists.)
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