Useful websites for experiments on code snippets

• Ideone.com: Accepts input of many languages
• LiveWorkSpace: Several versions of compilers for each supported language; users are allowed to modify compilation parameters
• GCC Explorer: C and C++ only, shows the assembly result from input C/C++ code interactively

Utilize uninitialized memory: integer set

Using Uninitialized Memory for Fun and Profit
Quite interesting application. I guess it makes Purify, Valgrind, Coverity, etc. unhappy. :P