visual studio code format document on c++ does not work

Also all of my files are in the same directory so I don't know what is going on. I assume its not reading my header file correctly which is why its not adding all of the other files into main. I also tried the following but I still get tons of undefined reference for every function outside of main.

Here is what my tasks.json file looks like.

I want to run it inside of vscode so I don't always have to create a new exe (makes it easier for testing / debugging) and so that I don't have to type in all of the file names in. I have however been able to run single files inside of vscode without trouble. When I run 'Format Document', the file is not formatted. gcc -o test.exe main.c getch.c getop.c stack.c When I run 'Format Document', the file is formatted. This is why I assume it's an issue with my vscode settings here is what I typed into the terminal. I have been able to compile it into an exe via the terminal and I can confirm it runs perfectly. I have watched multiple videos and read countless other posts about this but nothing so far has been able to resolve my issue.

I am using vscode (on windows 10) and I am trying to figure out how to compile my code into an exe and how to run it inside of vscode but I keep getting an undefined reference error.

Visual studio code format document on c++ does not work