C++ Program using function overloading to calculate the area of rectangle, area of triangle using Hero’s formula and area of circle.

Program using function overloading to calculate the area of rectangle, area of triangle using Hero’s formula and area of circle.

#include <iostream.h>
#include <conio.h>
#include <iomanip.h>
#include <math.h>
float area(float a, float b , float c);
float area(float l, float w);
float  area(float  r);
void main()
{
char ch;
float len, wid, n1, n2, n3, ar;
float  radius;
int choice1;
clrscr();
cout << "\n1. For area of triangle ";
cout << "\n2. For area of rectangle ";
cout << "\n3.  For area of circle ";
cout << "\nEnter choice : ";
cin >> choice1;
if (choice1 == 1)
{
cout << "\nEnter the three sides of triangle : ";
cin >> n1 >> n2 >> n3;
ar = area(n1, n2, n3);
cout << "\nArea of triangle is : " << ar;
}
if (choice1 == 2)
{
cout << "\nEnter the length : ";
cin >> len;
cout << "\nEnter the width : ";
cin >> wid;
cout << "\nArea of rectangle is: " << area(len, wid);
}
if (choice1 == 3)
{
cout << "\nEnter the radius : ";
cin >> radius;
cout << "\nArea of circle : " << area(radius);
}
}
float area(float a, float b , float c)
{
float s;
float a1;
s = (a + b + c) / 2;
a1 = sqrt(s * (s-a) * (s-b) * (s-c));
return(a1);
}
float area(float l, float w)
{
return(l*w);
}
float  area( float  radius)
{
return(3.14 * radius * radius);
}

step by step explanation:

1.the header file "iostream.h" is used to include the function cin and cout.
2.the header file"conio.h"is used to include the function like getch and clrscr.
3.the header file"math.h" is used to calculate the mathematical function.
4.float area is a function of void type.
5.main is also a function of void type it is used during the curley brackets.