a2zinterviews

17.	What is the syntax for comments in C?
	Below is the syntax for comments in C. The characters or words or anything which are given between "/*" and "*/", won't be considered by C compiler for compilation process. These will be ignored by C compiler during compilations. Syntax : /* your comments here */
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18.	List out some of C compilers?
	There are so many compilers available in market for Windows operating system and UNIX. We are listing some of them here for your reference. AMPC CCS C Compiler ch clang cygwin Digital mars GCC compiler MikroC Compiler Portable C Compiler,Power C, QuickC, Ritchie C Compiler, Small– C.
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19.	What is the difference between exit() and return() in C?
	exit() is a system call which terminates current process. exit() is not an instruction of C language. Whereas, return() is a C language instructions/statements and it returns from the current function (i.e. provides exit status to calling function and provides control back to the calling functions).
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20.	What is the difference between calloc and malloc?
	calloc and malloc are used for dynamic memory allocation. calloc initializes the memory locations to zero by default but malloc memory contains garbage values.
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