Happy Mittal questions

• Good practice in Java File I/O
• initialization of objects in c++
• What makes an NP-hard problem not to be an NP-complete problem?
• How to generate all possible combinations n-bit strings?
• Proving a Language to be regular
• Function declaration in C and C++
• Pass temporary object to function that takes pointer
• How to declare printf()?
• Prolog program to find equality of two lists in any order
• 'echo' newline suppression [duplicate]

Happy Mittal answers