Calculate the area of circle using c program, C/C++ Programming

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Calculate the area of circle using c program:

const float Pi = 3.1415926;

inline float area(const float r) {return Pi * r * r;}

main()

{

float radius;

cout << "Enter the radius of a circle: ";

cin >> radius;

cout << "The area is " << area(radius) << "\n";

return 0;

}

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