解引用运算符

解引用运算符（dereference operator）或称间址运算符（indirection operator）。C语言编程语言家族中常表示为"*" (一个星号)，为单元运算符，作用于1个指针变量，返回该指针地址的等效<a href="/wiki/%E5%B7%A6%E5%80%BC" class="mw-redirect" title="左值">左值</a>。这被称为指针的解引用。例如： int x; int *p; // * is used in the declaration: // p is a pointer to an integer, since (after dereferencing), // *p is an integer x = 0; // now x == 0 p = &x; // & takes the address of x // now *p == 0, since p == &x and therefore *p == x *p = 1; // equivalent to x = 1, since p == &x // now *p == 1 and x == 1 在C语言中，&是解引用运算符*的逆运算。因此*&s等价于s。例如： p = &s; // the address of s has been assigned to p; p == &s; // *p is equivalent to s 结构s的成员a的值可表示为s.a。若指针p指向s (即p == &s), s.a等价于(*p).a，也可用结构解引用运算符作为语法糖缩写表示为p->a： p = &s; // the address of s has been assigned to p; p == &s; // s.a is equivalent to (*p).a // s.a is equivalent to p->a // (*p).a is equivalent to p->a Unix的外壳脚本以及一些工具软件如Makefile中，美元符"$"为解引用运算符，用于把变量名字转译为其内容。