cpp-programming/OOP1-Lab5/Source.cpp at main · AvraamG/cpp-programming · GitHub

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// Practical Lab Assignment-7(Week 9)

// ID:U1910049 Name: Rustam Zokirov

// Program to calculate area of a circle using functions

#include <iostream>

#include <math.h> //C++ libriry which is including "pow" and PI=3.14

using namespace std;

float area(float radius)

{ // function for calculating the area

float area;

area = (atan(1) * 4) * (pow(radius, 2)); //"atan" is the function which is finding the PI=3.14

return area;

} // end function "area"

int main1()

{

float radius;

cout << "Please enter the radius of circle: ";

cin >> radius; // inputing the radius

if (radius > 0)

cout << area(radius) << endl; // calling the function "area" for calculating the Area of Circle

else

cout << "INVALID Radius!" << endl; // if radius is a negative number or equal to zero the program will show "Invalid radius"

system("pause");

return 0;

}

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