> For the complete documentation index, see [llms.txt](https://jacky-chen.gitbook.io/jackychen/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jacky-chen.gitbook.io/jackychen/others/yu-yan-zhi-biao-gai-nian.md).

# Ｃ語言指標概念

## 教學連結

* [**C語言: 超好懂的指標，初學者請進**](https://hellolynn.hpd.io/2017/05/15/c%E8%AA%9E%E8%A8%80-%E8%B6%85%E5%A5%BD%E6%87%82%E7%9A%84%E6%8C%87%E6%A8%99%EF%BC%8C%E5%88%9D%E5%AD%B8%E8%80%85%E8%AB%8B%E9%80%B2%EF%BD%9E/)
* [**雙重指標**](https://openhome.cc/Gossip/CGossip/DoublePointer.html)

## 範例

```c
#include <stdio.h>

int main(void) {
    int b = 2;
    int* pointer = &b;

    printf("變數 b 的值：%d\n", b);            //2
    printf("變數 b 的地址：%p\n", &b);         //0x7fff551b49c8
    printf("pointer 的值：%p\n", pointer);    //0x7fff551b49c8
    printf("\n"); //換行

    *pointer = 100;

    printf("*pointer 的值：%d\n", *pointer);        //100
    printf("變數 b 的值：%d\n", b);                  //100
    printf("變數 pointer 的地址：%p\n", &pointer);   //0x7fff55149c0

    return 0;
}
```