Steps to follow:
Install MinGW first, follow instructions here
http://prllab.wixsite.com/prl-lab-en-prgcl/forum/welcome-to-programming/install-eclipse-and-set-up-compiler
Setup system environment for C:\MinGW
https://www.ics.uci.edu/~pattis/common/handouts/mingweclipse/mingw.html
https://www.youtube.com/watch?v=DHekr3EtDOA
Search windows -> Command prompt
C:\Users\Mike Min\eclipse-workspace\cprogram\src is the directory where your source file (*.c) is