1. 安装vscode扩展
   
2. 新建一个项目叫hello_world，创建图中的文件
   
3. 设置task.json的文件内容如下：

{
  "version": "2.0.0",
  "tasks": [
    {
      "type": "cppbuild",
      "label": "build_c",
      "command": "/usr/bin/gcc",
      "args": [
        "${workspaceFolder}/*.c",
        "${workspaceFolder}/*.h",
        "-fdiagnostics-color=always",
        "-g",
        "-o",
        "${workspaceFolder}/main.out"
      ],
      "options": {
        "cwd": "${fileDirname}"
      },
      "problemMatcher": [
        "$gcc"
      ],
      "group": {
        "kind": "build",
        "isDefault": true
      },
      "detail": "compiler: /usr/bin/gcc"
    }
  ]
}

此时已经可以编译并运行可执行文件main.out，但是还不能调试

4. 终端执行sudo yum -y install gdb，安装gdb调试器
5. 设置launch.json的文件内容如下：

{
    // Use IntelliSense to learn about possible attributes.
    // Hover to view descriptions of existing attributes.
    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
    "version": "0.2.0",
    "configurations": [
        {
            "name": "g++ - Build and debug active file",
            "type": "cppdbg",
            "request": "launch",
            "program": "${workspaceFolder}/main.out",
            "args": [],
            "stopAtEntry": false,
            "cwd": "${fileDirname}",
            "environment": [],
            "externalConsole": false,
            "MIMode": "gdb",
            "setupCommands": [
                {
                    "description": "Enable pretty-printing for gdb",
                    "text": "-enable-pretty-printing",
                    "ignoreFailures": true
                }
            ],
            "preLaunchTask": "build_c",
            "miDebuggerPath": "/usr/bin/gdb"
            //ubuntu出现[1] + Done “/usr/bin/gdb“ --interpreter=的问题，就加上下面这句
            "miDebuggerArgs": "-q -ex quit; wait() { fg >/dev/null; }; /bin/gdb -q --interpreter=mi",
        }
    ]
}

6. 设置main.c的内容如下：

#include <stdio.h>
#include "aa.h"

int main()
{
  int odd = 0, even = 0;
  for (int num = 2; num <= 100; num = num + 2)
  {
    even += num;
    odd = odd + num - 1;
  }
  printf("Odd number sum is %d\n", odd);
  printf("Even number sum is %d\n", even);
  return 0;
}

7. 按F5执行调试，按Ctrl+F5直接运行

注意Vscode格式化代码需要按Ctrl+Shift+I，在Linux上这与Windows上不同