References

C Reference sites for beginners to advanced learners 

 

http://www.c4learn.com/learn-c-programming-language/

http://www.tutorialspoint.com/cprogramming/

http://www.programiz.com/c-programming

http://www.w3schools.in/c/

http://www.cprogrammingexpert.com/C/Tutorial/

Java Reference sites for beginners to advanced learners 

 

http://www.javatpoint.com/java-tutorial

http://www.javatpoint.com/java-oops-concepts

http://www.tutorialspoint.com/java/

http://www.c4learn.com/javaprogramming/ 

http://www.homeandlearn.co.uk/java/java.html

https://docs.oracle.com/javase/tutorial/java/

C#  Reference sites for beginners to advanced learners 

 

http://www.tutorialspoint.com/csharp/

http://www.csharp-station.com/Tutorial.aspx

http://csharp.net-tutorials.com/

http://www.homeandlearn.co.uk/csharp/csharp.html