指针中(星号)的用途到底是什么? [英] What exactly is the purpose of the (asterisk) in pointers?

问题描述

我是编程的新手，我正在尝试将指针"的想法包扎起来.

I'm new to programming and I'm trying to wrap my head around the idea of 'pointers'.

int main()
{
    int x = 5;
    int *pointerToInteger = & x;
    cout<<pointerToInteger;

}

为什么当我cout << pointerToInteger;时输出为十六进制值，但是当我使用cout << *pointerToInteger;时却输出为5(x = 5).

Why is it that when I cout << pointerToInteger; the output is a hexdecimal value, BUT when I use cout << *pointerToInteger; the output is 5 ( x=5).

推荐答案

*根据上下文具有不同的含义.

* has different meaning depending on the context.

1. 指针的声明

1. Declaration of a pointer

int* ap;  // It defines ap to be a pointer to an int.

void foo(int* p); // Declares function foo.
                  // foo expects a pointer to an int as an argument.

取消引用表达式中的指针.

Dereference a pointer in an expression.

int i = 0;
int* ap = &i;   // ap points to i
*ap = 10;       // Indirectly sets the value of i to 10

乘法运算符.

A multiplication operator.

int i = 10*20; // Needs no explanation.

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