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It is because compiler is unaware of user-defined function, types of argument passed to function and return type. In C++, function prototype is a declaration of function without its body to give compiler information about user-defined function. Function prototype in the above example is: int add(int, int); C++ Functions. A function is a group of statements that together perform a task. Every C++ program has at least one function, which is main(), and all the most trivial programs can define additional functions. You can divide up your code into separate functions. C also allows to declare and define functions separately, this is specially needed in case of library functions. The library functions are declared in header files Learn how to define a function in C or C++. declare the add function int add (int, int); // define the add function later int add (int lhs, int rhs) Functions tutorial Functions in C++ with example. By Chaitanya Singh | Filed Under: Learn C++ #include using namespace std; //Function declaration int sum(int,int); given at the beginning of this tutorial is an example of user-defined function. In C++, a function is a group of statements that is given a name, and which can The parameters in the function declaration have a clear correspondence to the Learn how to take advantage of auto_ptr for managing memory in C++. The key to writing the declaration for a function pointer is that you're just writing out the C++ functions are group of statements in a single logical unit to perform Programming) language like C, programs are divided into different functions but in Functions in C++. Functions are used to provide modularity to a program. Creating an application using function makes it easier to understand, edit, check errors