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C++

Area of the Circle in C++

I wrote this simple program in C++ to ask the user to give a radius value and then the program will compute the area of the circle using the C++ programming language.

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Program Listing


area_circle.cpp

#include <iostream>
#include <iomanip>

using namespace std;

const float PI = 3.1416;

float solve_area(int r);

float solve_area(int r)
{
    float area=0.00;

    area = (PI * r * r);
    cout << "\n\n";
    cout << setprecision(2) << fixed;
    cout << "The are of the circle is "
         << area << ".";
    cout << "\n\n";
    system("pause");
}

 main()
 {
      int radius=0;
      cout << "\t   AREA OF THE CIRCLE ";
      cout << "\n\n";
      cout << "Enter the radius :=> ";
      cin >> radius;
      solve_area(radius);
 }









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