QuickReference/source/_posts/language/C.md

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C lang C C++ 12462 2025-01-15 20:41:26

c lang在windows下的开发VS code

WinLibs - GCC+MinGW-w64 compiler for Windows下载你需要的版本 解压到D:\ProgramModule,并将 bin\加入环境变量PATH 打开新的Terminal输入gcc -v,查看gcc是否安装成功 在VS code 的插件管理下载Code RunnerC\C++这两个插件 在*.c源文件的内容区,右键点击Run Code ,即可运行成功

数据类型

  • 整数类型

    short a = 12;     int b = 100;     long c = 1000L;     long long d = 1000000LL;     unsigned int e = 10;     printf("a: %hd\n",a);     printf("b: %d\n",b);     printf("c: %ld\n",c);     printf("d: %lld\n",d);     printf("e: %u\n",e);     printf("f: %.3f\n",f); ```

  • 小数类型
      float f = 3.14F;
      printf("f: %.3f\n",f);
      double g = 5.65;
      printf("g: %.2lf\n",g);
    
  • 字符类型
      char h = 'x';
      printf("x: %c\n",x);
    

类型转换

  • 隐式转换
  • 强制转换
      int b = 23;
      short c = (short) b;
    

数组

#include <stdio.h>

int main(){
    int arr [10] = {2,3,4,5,6,7,8,9,10,11};
    arr[0] = 1525;
    *(arr+1) = 25;
    int len = sizeof(arr)/sizeof(arr[0]);
    void printArr(int arr[], int len){
        for (int i = 0; i < len;i++){
            printf("%d\t",arr[i]);
        }
    }
    printArr(arr,len);
    return 0;
}

指针

    // swap the value of a and b
    void swap(int* x, int* y){
        int temp = *x;
        *x = *y;
        *y = temp;

    }
    int a = 5;
    int b = 10;
    swap(&a, &b);
    printf("a = %d b = %d\n", a, b);