C++ QNA

C++ QNA

• 1.
  C++ 1. FUNCTION OVERLOADING:The method of using the same function name for different functions is simply called function overloading. Each function has a unique signature or different parameters. 2. DEFAULT ARGUMENT: A default argument is an argument to a function that a programmer is not required to specify. In C++ allow the programmer to specify default arguments that always have a value, even if one is not specified when calling the function. When a memory needed depends on user input. On these cases, programs need to dynamically allocate memory. And this Memory allocated during run time. 3. WHAT ARE APPLICATIONS? One use of dynamically allocated memory is to allocate memory of variable size which is not possible with compiler allocated memory except variable length arrays. The most important use is flexibility provided to programmers. We are free to allocate and deallocate memory whenever we need and whenever we don’t need anymore. There are many cases where this flexibility helps. Examples of such cases are Linked List, Tree, etc. 4. NEW OPERATOR: 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, new operator is also used to allocate a block (an array) of memory of type data-type. 5. DELETE OPERATOR: Since it is programmer’s responsibility to deallocate dynamically allocated memory, programmers are provided delete operator by C++ language. Perhaps the simplest user-defined data type is the enumerated type. An enumerated type (also called an enumeration) is a data type where every possible value is defined as a symbolic constant (called an enumerator). Enumerations are defined via the “enum” keyword. An enumeration is a user-defined data type that consists of integral constants. To define an enumeration, keyword “enum” is used.