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Functions in programming are blocks of code designed to perform specific tasks.User-defined functions, on the other hand, allow programmers to create their own functions to perform specific tasks.There are two types of functions: predefined and user-defined.Predefined functions are built-in functions that are provided by the programming language or its standard library.Value-returning functions consist of a heading, which includes the function's name and other properties, such as the return type.They also have formal parameters, which are variables declared in the heading, and actual parameters, which are variables or expressions passed to the function during a function call.The syntax of a value-returning function includes the function's type, name, formal parameter list, and a block of statements.The formal parameter list specifies the data types and identifiers of the parameters.

Functions in programming are blocks of code designed to perform specific tasks. There are two types of functions: predefined and user-defined.

Predefined functions are built-in functions that are provided by the programming language or its standard library. They offer a range of functionality and can be directly used in code.

User-defined functions, on the other hand, allow programmers to create their own functions to perform specific tasks. They can be classified into two types: void functions, which do not have a return type, and value-returning functions, which do have a return type.

Value-returning functions consist of a heading, which includes the function's name and other properties, such as the return type. They also have formal parameters, which are variables declared in the heading, and actual parameters, which are variables or expressions passed to the function during a function call.

The syntax of a value-returning function includes the function's type, name, formal parameter list, and a block of statements. The formal parameter list specifies the data types and identifiers of the parameters.

A function call is made by using the function's name and providing the actual parameter list, which includes the values or variables to be passed to the function.

A value-returning function can have an empty formal parameter list, denoted by empty parentheses. In this case, the function call would also have empty parentheses.

The return statement in a value-returning function is used to return a value or expression back to the calling code.

A function prototype is a declaration of a function that includes the function's heading without the body. It is used to inform the compiler about the function's existence and signature before its actual implementation.