c++ program to find area of circle using functions

BOOKC, this time share about c++ program to find area of circle using functions
Cpp tutorial to calculate area of circle
  •  User enter radius or diameter of circle.
  •  Program should have two functions one which takes radius as parameter and second takes diameter as parameter.
  •  If user enters wrong option then tell users its valid selection and chose again the right option.
This Cpp Tutorial covers the concept of
  • if else if statement
  • for loop
  • function with parameter and return value
Cpp code compiler used: Codeblocks C++ Compiler

#include <iostream>
#define PI 3.14159
using namespace std;

float
AreaOfCircle(float radius);
float
AreaWithDiameter(float diameter);

int
main()
{

float
radius,diameter,circleArea;
char
choice='0';
cout<<"\n\t\t\tFind Area Of Circle:"<<endl;


for
(;choice!='1'&&choice!='2';)
{

cout<<"\nEnter 1 to Enter Radius OR
2 to Enter Diameter: "
;
cin>>choice;
if
(choice!='1'&&choice!='2')
cout<<"\n\t\tEnter a VALID Option ";

}


if
(choice=='1')
{

cout <<"\n\t\tEnter Radius To Find Area: ";
cin>>radius;
circleArea=AreaOfCircle(radius);
}

else if
(choice=='2')
{

cout <<"\n\t\tEnter Diameter To Find Area: ";
cin>>diameter;
circleArea=AreaWithDiameter(diameter);

}

cout<<"\n\n\t\tArea of Circle is:->> "<<circleArea<<endl;
return
0;
}


float
AreaOfCircle(float radius)
{

return
(PI*(radius*radius));

}


float
AreaWithDiameter(float diameter)
{


return
(AreaOfCircle(diameter/2));
}



output of program

Program explanation
  • Program has two functions one for radius and one for diameter both called upon user choice
  • Both calculates the radius and diameter according to formula and return result value from where they have called
  • A for loop is used to prevent the wrong choice selection it will break only if user enters valid option 1 or 2 else it will continue to ask user to enter valid option
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