Vscode has a header file and cannot be compiled. Solution
在使用VSCODE进行C语言程序设计时，如果用到了头文件声明函数，.c文件定义函数，在编译时尽管已经引用了相应的头文件，VSCODE文本编辑器也没有报错，但仍然无法编译。
错误提示如下：
d:/ComputerHomework/2019_winter/main.c:10: undefined reference to `ReadPathTkFile'
这是由于VSCODE实际上是一个文本编辑器，不是一个IDE，它不会自动链接项目通过头文件引用的.c文件。要解决这个问题，就要告诉编译器需要链接哪些文件。
解决方法
在当前路径下的.vscode文件夹中找到tasks.json，找到"args"属性，在其中"-g"后，"-o"前加入"${fileDirname}\\YourcFileName.c"，每组字符串以逗号分隔。YourcFileName.c即项目中要参与编译的文件名。
样例如下（仅参考填写格式，具体参数不相同正常）
{
"tasks": [
{
"type": "shell",
"label": "gcc.exe build active file",
"command": "C:\\mingw64\\bin\\gcc.exe",
"args": [
"-g",
"${file}",
"${fileDirname}\\IstkFile.c",
"${fileDirname}\\PrintQuestion.c",
"${fileDirname}\\MarkingSystemLib.c",
"${fileDirname}\\zqyLib.c",
"-o",
"${fileDirname}\\${fileBasenameNoExtension}.exe"
],
"options": {
"cwd": "C:\\mingw64\\bin"
}
}
],
"version": "2.0.0"
}推荐学习：vscode教程
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