19.Explain the difference between compile time and run time errors. 20.Summarise the commands used for compiling GNU gcc/g++ in Linux OS. 21.List the steps involved in compiling C/C++ programs in UNIX...

19.Explain the difference between compile time and run time errors.

20.Summarise the commands used for compiling GNU gcc/g++ in Linux OS.

21.List the steps involved in compiling C/C++ programs in UNIX OS. Elucidate the various steps involved in building Visual C++ programs under Visual studio .NET environment.

22.What is an identifier? Explain how a user defined identifier is different from a standard identifier.