C++ Circle Area or Circumference Program

Task: Write a C++ Program To Calculate Circle Area or Circumference according to the User choice.

Write a C++ Program To Calculate Circle Area or Circumference according to the User choice.

The Source Code of C++ Circle Program

// Write a program that uses two user defined functions
// for calculating area and circumference of a circle.
//The program will input radius and asks the user
// to enter a choice 1 or 2.
//If the user enters 1, it will display area
// if the user eneters 2 then circumference
//of the circle will be the output

#include<iostream>
using namespace std;
void area(float);
void circumference(float);
int main()
{
	float radius;
	int choice;
	cout<<"Enter Radius of Circle: ";
	cin>>radius;
	cout<<"Enter Your Choice 1 for Area and 2 for Circumference:";
	cin>>choice;
	
	if(choice==1)
	  area(radius);
	else if(choice==2)
	  circumference(radius);
	else
	  cout<<"Wrong choice!";
	
	return 0;
}


void area(float r)
{
	cout<<"Area of Circle="<<(3.1415 * r* r);
}
void circumference(float r)
{
	cout<<"Circumferenceb of Circle="<<(2.0 * 3.1415 * r);
}

Output of the C++ Circle Program Calculations

Enter Radius of Circle: 2.5
Enter Your Choice 1 for Area and 2 for Circumference:1
Area of Circle=19.6344
——————————–
Process exited after 18.92 seconds with return value 0
Press any key to continue . . .

Enter Radius of Circle: 2.5
Enter Your Choice 1 for Area and 2 for Circumference:2
Circumferenceb of Circle=15.7075
——————————–
Process exited after 21.03 seconds with return value 0
Press any key to continue . . .

Enter Radius of Circle: 5.26
Enter Your Choice 1 for Area and 2 for Circumference:1
Area of Circle=86.9178
——————————–
Process exited after 11.3 seconds with return value 0
Press any key to continue . . .

Enter Radius of Circle: 10.67
Enter Your Choice 1 for Area and 2 for Circumference:2
Circumferenceb of Circle=67.0396
——————————–
Process exited after 17.52 seconds with return value 0
Press any key to continue . . .