1. TOPIC: FUNCTION OVERLOADING

2. FUNCTION OVERLOADING:
C++ allows you to specify more than one definition for a function name or an operator in the same scope, which is called function overloading and operator overloading respectively.

3. STATEMENT 1:
You can have multiple definitions for the same function name in the same scope. The definition of the function must differ from each other by the types and/or the number of arguments in the argument list.
You can not overload function declarations that differ only by return type.

4. STATEMENT 2:
An overloaded declaration is a declaration that had been declared with the same name as a previously declared declaration in the same scope, except that both declarations have different arguments and obviously different definition (implementation).

5. Ways to overload a function
By changing number of Arguments.
By having different types of argument.

6. Number of Arguments different
int sum (int x, int y) {
cout << x+y; }
int sum(int x, int y, int z)
cout << x+y+z;
int main() {
sum (10,20); // sum() with 2 parameter will be called sum(10,20,30); //sum() with 3 parameter will be called }

7. Different Datatype of Arguments
int sum(int x,int y) {
cout<< x+y; }
double sum(double x,double y)
cout << x+y;
int main() {
sum (10,20);
sum(10.5,20.5); }

8. EXAMPLE 1:(without class and object) Following is the example where same function calc() is being used

9. ANS CODE: #include<iostream.h> #include<conio.h>
int calc (int);
int calc (int,int);
int main() {
int s,a,b;
Cout<<“Enter a number:”
Cin>>s;
Cout<<“square is:”<<calc(s);
Cout<<“Enter two numbers:”
cin>>a>>b;
Cout<<“addition is:”<<cal(a,b);
return 0];
getch();
int calc (int x) {
return(x*x); }
int calc (int x,int y)
return(x+y)

10. EXAMPLE 2:(using class and object) Following is the example where same function print() is being used to print different data types:

11. ANS CODE: include <iostream> using namespace std;
class printData {
public:
void print(int i)
cout << "Printing int: " << i << endl; }
void print(double f)
cout << "Printing float: " << f << endl;
void print(char* c) {
cout << "Printing character: " << c << endl; };
int main(void) {
printData pd;
// Call print to print integer
pd.print(5);
// Call print to print float
pd.print( );
// Call print to print character
pd.print("Hello C++");
return 0; }

12. OUTPUT:
When the above code is compiled and executed, it produces the following result:
Printing int: 5
Printing float:
Printing character: Hello C++

13. END