Function overloading - C++ [1/1]

In function overloading, the function is said to be overloaded when same name is given to different functions. However, the functions will differ at least in any one of the these. The number of parameters, the data type of parameters, the order of appearance these three together are referred to as the function signature. While overloading a function, the return types of the function need not differ.

1. Functions differ in function signature
2. Return types of functions need not differ

The code depicts function overloading. There are two functions with the same name calc. In the main function, when the function calc is invoked using the object a, depending up on the type and number of parameters, the compiler binds the call to the function. Hence, when calc(5) is called, the compiler checks for the function matching the parameter type. So calc(int num l) will be invoked and parameter will be passed to the function at runtime and output displayed. Similarly, when calc(6,7) is called, it looks for the same function with two integers as parameter and bind the respective function to the call.