Dynamic memory is allocated using operator new. new is followed by a data . C++ integrates the operators new and delete for allocating dynamic memory.and you
Often some situation arises in programming where data or input is dynamic in nature, i. A live scenario where the program is developed to process lists of employees of an organization. The list grows as the names are added and shrink as the names get deleted. With the increase in name the memory allocate space to the list to accommodate additional data items. Such situations in programming require dynamic memory management techniques.
Arrays can be used to store multiple homogenous data but there are serious drawbacks of using arrays. You should allocate the memory of an array when you declare it but most of the time, the exact memory needed cannot be determined until runtime.
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Dynamically allocated memory is allocated on Heap and non-static and local variables get memory allocated on Stack Refer Memory Layout C Programs for details. How is it different from memory allocated to normal variables? C uses malloc and calloc function to allocate memory dynamically at run time and uses free function to free dynamically allocated memory. The new operator denotes a request for memory allocation on the Heap. If sufficient memory is available, new operator initializes the memory and returns the address of the newly allocated and initialized memory to the pointer variable.
Many times, you are not aware in advance how much memory you will need to store particular information in a defined variable and the size of required memory can be determined at run time. This operator is called new operator. If you are not in need of dynamically allocated memory anymore, you can use delete operator, which de-allocates memory that was previously allocated by new operator. There is following generic syntax to use new operator to allocate memory dynamically for any data-type. Here, data-type could be any built-in data type including an array or any user defined data types include class or structure. Let us start with built-in data types.
C++ Dynamic Memory