gcc compiler giving error because missing files for flags

Question

I am trying to compile code for a course. I want to use the -Wall -pedantic and -std=c99 tag since those are used to check the code by the teachers. In a previous course where I had to do this I ran the code on a linux virtual boot provided by the teachers where everything was preinstalled to run the code. But since then I switched over my PC to linux from windows so I do not have those things installed. when running the following command in my terminal

gcc −std=c99 −Wall −pedantic myprogram.c

I get the following errors roughly translated to english.

gcc: error: -std=cgg: File or directory does not exist
gcc: error: -Wall: File or directory does not exist
gcc: error: -pedantic: File or directory does not exist

what do I have to install and how to make this working?