Linux GCC Compiler Output in Mint: What to do with the file?

Question

I wrote a simple c program. saved it with "c" suffix. Went to the terminal (in Linux Mint), typed in

gcc -o outputfile inputfile.c

In the directory containing inputfile.c a file called outputfile appeared, as I expected. I want to run the program, but clicking on the file does nothing.

What am I doing wrong?