sizeof('a')在C与C++中的区别

在C语言中:

char a = 'a';
sizeof(char) = 1;
sizeof(a) = 1;
sizeof('a') = 4;

在C++语言中:

char a = 'a';
sizeof(char) = 1;
sizeof(a) = 1;
sizeof('a') = 1;

这是ISO C和ISO C++的一个区别：

In C, character literals（字符常量） such as 'a' have type int, and thus sizeof('a') is equal to sizeof(int).

In C++, character literals have type char, and thus sizeof('a') is equal to sizeof(char).