SENIOR TECHTUNERS HELP ME PLEASE ...

I want to make a small website on c code compilation...the main thing of this website will be

1. anyone can visit this site(no registration needed)...

2. they will type their program in my site...

3. there will be a text box for taking the input from the user...

4. when user click on the "Submit" button the desired result will be shown...

i am able to make the design of the site...but i stucked in some problem...

1. how i get the c compiler...

2. how i embed the compiler with my site...

3.  is anything extra needed to check and compile the program, typed by visitor?

4. how i show the output?

i want to make the site with javascript. i will really thankful if you solve my problem...