Function Overloading in C++

 

Function Overloading: -> Using same function name that can perform different task.

eg.  int add(int a,int b);

int add(int a,int b,int c);

float add(float a,float b);

Here,we have same function name add but we have different parameters to perform calculations

1. Program to find maximum of 2 or 3 numbers by function overloading.

 #include<iostream.h>

#include<conio.h>

void maximum(int a,int b,int c);

void maximum(int a,int b);

void main(){

int a,b,c,n;

cout<<"Enter either two or three to compare:"<<endl;

cin>>n;

if(n==2)

{

maximum(a,b);

}

else if(n==3)

maximum(a,b,c);

else

{

cout<<"Enter Valid number: 2 or 3"<<endl;

}

getch();

}

void maximum(int a,int b)

{

cout<<"Enter the 2 numbers to compare:"<<endl;

cin>>a>>b;

if(a>b)

cout<<a<<" is maximum"<<endl;

else

cout<<b<<" is maximum"<<endl;

}

void maximum(int a,int b,int c)

{

cout<<"Enter the 3 numbers to compare:"<<endl;

cin>>a>>b>>c;

if(a>b)

{

if(a>c)

cout<<a<<" is maximum"<<endl;

else

cout<<c<<" is maximum"<<endl;

}

else if(b>c)

cout<<b<<" is maximum"<<endl;

else

cout<<c<<" is maximum"<<endl;

} 

Output:

2.Program to find the area of 3 objects: cube,cylinder and rectanglur box using function overloading.

  #include<iostream.h>

  #include<conio.h>

   #include<math.h>

    #define pi 3.14

void area(float l,float b);

 void area(int l);

 void area(float r);

void main()

{

float l,b,r,n;

cout<<"Enter any number from 1-3 to find Area of following optionsin \n 1. Rectangular box \n 2. Cube \n  3. Cylinder"<<endl;

 cin>>n;

 if(n==1)

 area(l,b);

 else if(n==2)

  area(l);

  else if(n==3)

  area(r);

else

cout<<"Enter number between 1 - 3";

getch();

}

void area(float l,float b)

 {

float a;

 cout<<"Enter length of the rectangle:";

  cin>>l;

  cout<<"Enter breadth of the rectangle:";

  cin>>b;

  a=l*b;

   cout<<"Area of the rectangular box is: "<<a;

}

void area(int l)

{

float a;

cout<<"Enter length of the cube:";

 cin>> l;

 a=pow(1,2);

  cout<<"Area of the cube is: "<<a;

}

void area(float r)

{

float a;

 cout<<"Enter radius of the cylinder:";

  cin>>r;

   a=pi *pow(r,2);

    cout<<"Area of the cylinder is: "<<a;

              }

Output:

3. Program to calculate the volume of cylinder,cube and rectangular bofunction Overloading.

#include<iostream.h>

#include<conio.h>

 #include<math.h>

  #define pi 3.14

void volume(float l,float b,float h);

 void volume(float l);

 void volume(float r, float h);

void main()

{

float l,b,r,h,a,i;

for(i=0;i<3;i++)

{

cout<<"Enter number from 1-3 to perform calculations in \n 1. Rectangular Box \n 2 Cube \n  3. Cylinder"<<endl<<endl;

cin>>a;

 if(a==1)

  volume(l,b,h);

   else if(a==2)

    volume(l);

    else if(a==3)

     volume(r,h);

     else

     cout<<"Enter valid number not exceeding 3";

     }

      getch();

 }

void volume(float l,float b,float h)

{

float v;

 cout<<"Enter length of the rectangle:";

 cin>>l;

 cout<<"Enter breadth of the rectangle:";

  cin>>b;

  cout<<"Enter height of the rectangle:";

   cin>>h;

 v=l*b*h;

 cout<<"Volume of the rectangular box is: "<<v<<endl;

 }

void volume(float l)

{

float v;

 cout<<"Enter length of the cube.";

  cin>>l;

  v=pow(l,3);

  cout<<"Volume of the cube is: "<<v<<endl;

  }

void volume(float r, float h)

 {

  float v;

   cout<<"Enter radius of the cylinder.";

    cin>>r;

    cout<<"Enter height of the cylinder:",

    cin>>h;

v=pi*pow(r,2)*h;

 cout<<"Volume of the cylinder is: "<<v<<endl;

}

Output:

4. Program to calculate the volume and surface area of Sphere using function overloading.

#include<iostream.h>

#include<conio.h>

#include<math.h>

#define pi 3.14

void computeSphere(float &v, float &s, float r);

void main()

{

float v,s,r;

cout<<"Enter radius of the sphere:";

cin>>r;

computeSphere(v,s,r);

getch();

}

void computeSphere(float &v, float &s, float r){

v=4/3*pi*pow(r,3);

s=pi*pow(r,2);

cout<<"Volume of Sphere: "<<v <<endl;

cout<<"Area of sphere:" <<s<<endl;

}

Output:

5. Program to calculate simple interest with given rate=5.5% and user given rate.

#include <iostream>

#include <conio.h>

 float si(float p, float t, float r=5.5)

 {

return (p*t*r)/100;

}

void main()

{

int p,t,r;

 cout<<"Enter value of principal: ";

  cin>>p;

   cout<<"Enter time(years): ";

    cin>>t;

      cout<<"Enter rate of interest: ";

       cin>>r;

        cout<<endl;

cout<<"Simple interest with user given rate = "<<si(p,t,r)<<endl;

 cout<<"Simple interest with defined rate-5.5 = "<<si(p, t);

  getch();

           }

Output: