解析C语言中空指针、空指针常量、NULL 0的详解

什么是空指针常量(null pointer constant)?[6.3.2.3-3] An integer constant expression with the value 0, or such an expression cast to type void *, is called a null pointer constant.这里告诉我们:0、0L、’\0’、3 – 3、0 * 17 (它们都是“integer constant expression”)以及 (void*)0 (tyc: 我觉得(void*)0应该算是一个空指针吧,更恰当一点)等都是空指针常量(注意 (char*)