82 lines
1.8 KiB
Markdown
82 lines
1.8 KiB
Markdown
---
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title: C lang
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tags: C C++
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abbrlink: 12462
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date: 2025-01-15 20:41:26
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---
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### c lang在windows下的开发（VS code）
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[WinLibs - GCC+MinGW-w64 compiler for Windows](https://winlibs.com/#download-release)下载你需要的版本
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解压到`D:\ProgramModule`，并将 `bin\`加入环境变量`PATH`
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打开新的`Terminal`输入`gcc -v`，查看`gcc`是否安装成功
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在`VS code` 的插件管理下载`Code Runner`、`C\C++`这两个插件
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在`*.c`源文件的内容区，右键点击`Run Code` ，即可运行成功
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### 数据类型
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- 整数类型
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```c
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short a = 12;
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int b = 100;
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long c = 1000L;
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long long d = 1000000LL;
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unsigned int e = 10;
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printf("a: %hd\n",a);
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printf("b: %d\n",b);
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printf("c: %ld\n",c);
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printf("d: %lld\n",d);
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printf("e: %u\n",e);
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printf("f: %.3f\n",f);
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```
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- 小数类型
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```c
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float f = 3.14F;
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printf("f: %.3f\n",f);
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double g = 5.65;
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printf("g: %.2lf\n",g);
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```
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- 字符类型
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```c
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char h = 'x';
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printf("x: %c\n",x);
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```
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### 类型转换
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- 隐式转换
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- 强制转换
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```c
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int b = 23;
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short c = (short) b;
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```
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### 数组
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```c
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#include <stdio.h>
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int main(){
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int arr [10] = {2,3,4,5,6,7,8,9,10,11};
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arr[0] = 1525;
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*(arr+1) = 25;
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int len = sizeof(arr)/sizeof(arr[0]);
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void printArr(int arr[], int len){
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for (int i = 0; i < len;i++){
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printf("%d\t",arr[i]);
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}
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}
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printArr(arr,len);
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return 0;
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}
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```
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### 指针
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```c
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// swap the value of a and b
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void swap(int* x, int* y){
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int temp = *x;
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*x = *y;
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*y = temp;
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}
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int a = 5;
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int b = 10;
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swap(&a, &b);
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printf("a = %d b = %d\n", a, b);
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```
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