C language provides many functions that come in header files to deal with the allocation and management of memories. In this tutorial, you will find brief information about managing memory in your program using some functions and their respective header files.
malloc, calloc, or realloc are the three functions used to manipulate memory. These commonly used functions are available through the stdlib library so you must include this library in order to use them.
Unions is user-defined data type in C, which is used to store a collection of different kinds of data, just like a structure. However, with unions, you can only store information in one field at any one time.
typedef is a C keyword implemented to tell the compiler for assigning an alternative name to C's already exist data types. This keyword, typedef typically employed in association with user-defined data types in cases if the names of datatypes turn out to be a little complicated or intricate for a programmer to get or to use within programs.
Command-line arguments are arguments specified after a program name in the command line of operating systems (DOS or Linux) and these values are passed to your program at the time of execution from your operating system (OS).
In C, you can state the size of your structure (struct) or union members in the form of bits. This concept is to because of efficiently utilizing the memory when you know that your amount of a field or collection of fields is not going to exceed a specific limit or is in-between the desired range.