how to run c program online code example

Example 1: online c compiler

I Personally Like 
https://www.programiz.com/c-programming/online-compiler/

Example 2: online c compiler

You can try https://www.onlinegdb.com/ this as well, works really well for me.
You can also save code there.

Example 3: c compiler online

i reccomend online gdb https://www.onlinegdb.com/online_c_compiler

Example 4: learn c online

replit.com is your best shot tbh