C Programming - Memory Allocation - Discussion

@N. Gayathridevi.

In c++ editor goto help and look for alloc.h.

In that header file examples are given.

In C editor goto alloc.h you will find answer to this question and other memory management func:'s.

Memory allocated by malloc and calloc are deallocated by free in C.

Explain malloc and calloc with example?

What is the purpose of malloc?

Memory allocated by malloc or calloc : deallocated by free().
Memory allocated by new(in c++) : deallocated by delete().

Is the following statement a declaration or definition?

extern int i;

A. Declaration B. Definition
C. Function D. Error

Answer & Explanation

Answer: Option A.

Explanation:

Declaring is the way a programmer tells the compiler to expect a particular type, be it a variable, class/struct/union type, a function type (prototype) or a particular object instance. (ie. extern int i).

Declaration never reserves any space for the variable or instance in the program's memory; it simply a "hint" to the compiler that a use of the variable or instance is expected in the program. This hinting is technically called "forward reference".

Can anybody explain what is free() and farfree()?

Also Calloc() initialize the allocated memory to zero, while malloc() doesn't.

free() : Releases the specified block of memory back to the system.