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CPP Function Overloading

What is Functions Overloading?

  • In C++ you can create several functions with the same name. We says that these functions overload each other.
  • C++ require that those functions must differ in their parameter list with a different type of parameter, a different number of parameters or both.
    Overload Function example:
    Source code Result 
    // Demonstrates function polymorphism
#include <iostream>
// two function, getVolume, that overload each other
int getVolume(int length, int width , int height );
double getVolume(double length, double width );

int main() {
  int length = 100;
  int width = 50;
  int height = 2;
  int volume;
// The result of this should be 100*50*2=10000  
  volume = getVolume(length, width, height);
  std::cout << "1.volume equals:" << volume << "\n";
  double len = 120.2;
  double wid = 54.2;
  double vol;
// The result of this should be 120.2*54.2*1= 6514.84   
  vol = getVolume(len, wid);
  std::cout << "2.volume equals:" << vol << "\n";
  return 0;
}
// Implementation of the function  
int getVolume(int length, int width, int height) {
  return (length * width * height);
}
double getVolume(double length, double width) {
  return (length * width * 1.0);
}
    		 
    1.volume equals: 10000
2.volume equals: 6514.84

    You can download this example here (needed tools can be found in the right menu on this page).

  • Function overloading is also called function polymorphism. Poly means many, and morph means form: A polymorphic function is many-formed
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