IO is online editor and compiler where you can write and run code instantly. Whenever you come up with new idea, learn or teach programming, you and others can just write and run code.

IO engine provides stable running time, extremely low latency without any polling, and scalable infrastructure. We provide paiza.

IO API for your application. For business use, please contact info paiza. IO service. IO code runner engine.

Please contact info paiza. If your program is reading input from standard input and you forgot to provide input via stdin. Your program contains infinite loop, which may never break.

Your program contains infinite recursive function calls. Please save your data and refresh page to update. Source Code.

Editor Theme: Dark Light. Editor Mode: Normal Emacs vim. Font size: Small Medium Large. Buy me a coffee. Ruby code!

You can report a bug or give feedback by adding a comment below or by clicking "Contact me" link at the top right hand corner of the page.

Generators: Robots. Class variables Class variables belongs to whole class and can be accessible anywhere inside the class.

Variable name must start with. They must be initialized before use. Instance variables Instance variables belongs to a instance of the class.

They can be accessed from any instance of the class within a method. Variable name must start Global variables Scope is global and hence they can be accessible anywhere in the program.

If family: If, If-else, Nested-Ifs are used when you want to perform a certain set of operations based on conditional expressions.

If if conditional-expression code end If-else if conditional-expression code if condition is true else code if condition is false end Nested-If-else if condition-expression1 code if above condition is true elsif condition-expression2 code if above condition is true elsif condition-expression3 code if above condition is true Case: Case is similar to Switch statement, where it is used to execute one set of a statement from multiple conditions.