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 C++ Tutorials  >  Functions  >  Overloading Functions in C++

Function overloading is the process of using the same name for two or more functions. Each redefinition of a function must use different type of parameters, or different sequence of parameters, or different number of parameters. The number, type and sequence of parameters for a function is called the function signature.

The following program illustrates a function using different type of parameters:

//Program 7.9
//This program calculates sum of two numbers
int add(int iNum1, int iNum2)
return iNum1+iNum2;
float add(float fNum1, float iNum1)
return fNum1+iNum1;

void main()
cout<<add(20, 30)<<endl; //The function add(int, int) is called
float i= 9.6;
float b= 8.8;
cout<<add(i, b)<<endl; //The function add(float, float) is called

Two functions differing only in their return type cannot be overloaded. For example, overloading int add(int, int) and float add(int, int) would flag an error.


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