C++ User-defined function Types
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  • What you'll learn
    • ✓C++ User-defined Function Types (With Examples)
    ✓What are the types of user-defined functions in C++?
    ✓How many types of functions are there in CPP?
    ✓What are the user-defined data types in C++?
    ✓What is a user-defined function?
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  • There are four types of user-defined functions divided on the basis of arguments they accept and the value they return: Function with no arguments and no return value. Function with no arguments and a return value. Function with arguments and no return value. Function with arguments and with return value.
  • There are two types of functions in C programming: 1. Library Functions: are the functions which are declared in the C++ header files such as ceil(x), cos(x), exp(x), etc. 2.
  • Hence, the data types that are defined by the user are known as user-defined data types. For example; arrays, class, structure, union, Enumeration, pointer, etc. These data types hold more complexity than pre-defined data types.
  • A user-defined function has three important components: Function declaration. Function definition. Function call.
  • Identity Function, Linear Function, Quadratic Function, Cubic Function, and Polynomial Functions. Based on Range: Modulus Function, Rational Function, Signum Function, Even and Odd Functions, Periodic Functions, Greatest Integer Function, Inverse Function, and Composite Functions.
  • return_type function_name(parameter list) { // function body } The return_type specifies the data type of the value that the function returns. If the function does not return a value, the return_type should be void. The function_name is the name by which the function can be called.
  • User-defined functions have advantages like making programs easier to understand, maintain, and debug. The key parts of a user-defined function are the declaration, definition, and call. Functions can take arguments, return values, and be used recursively. Arrays and 2D arrays.
  • The polynomial function of degree one is termed a linear function. The polynomial function of degree two is termed a quadratic function.
  • Predefined functions are organized into separate libraries. I/O functions are in iostream header. Math functions are in cmath header. Some predefined C++ mathematical functions: pow(x,y)
  • A user-defined data type (UDT) is a data type that derived from an existing data type. You can use UDTs to extend the built-in types already available and create your own customized data types. There are six user-defined types: Distinct type. Structured type.

Requirement

User-defined functions in C++ are functions that are created by the user to perform a specific task. These functions can be called from anywhere within the program, just like built-in functions. In C++, you can define your own functions to perform specific tasks.

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