Write a program to find Area of a Circle in C++

Area of a Circle Formula: pi * r ^ 2

Source Code:

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#include <iostream.h> #include <conio.h> int main() { float A, r, r2, pi; cout << "Area of a Circle Formula: pi * r ^ 2\n"; cout << "Enter the value of r?\n"; cin >> r; pi = 3.1415; r2 = r * r; A = r2 * pi; cout << "\tArea of a Circle = " << A << " m^2 "<< endl; getch(); return 0; }//end main

Output:

Area of a Circle Formula: pi * r ^ 2
Enter the value of r?
4
 Area of a Circle = 50.246 m^2