namespace question

[fx11]

error: 'a' in namespace 'Rectangle' does not name a type
error: 'b' in namespace 'Rectangle' does not name a type

But why?

#include <iostream>

using namespace std;

namespace Circle
{
    const double pi = 3.14;
    double r = 100;
    double Area() { return (r*r*pi); }
}

namespace Rectangle
{
    double a, b;
    double Area() { return (a*b); }
}

    Rectangle::a = 20;
    Rectangle::b = 30;

int main()
{
    cout << "Circle:   " << Circle::Area() << endl;
    cout << "Rectangle:" << Rectangle::Area() << endl;

    return 0;
}

[joe864864]

Put it in main

int main()
{

	Rectangle::a = 20;
	Rectangle::b = 30;

	cout << "Circle:   " << Circle::Area() << endl;
	cout << "Rectangle:" << Rectangle::Area() << endl;

	return 0;
}

[whitenite1]

@fx11

Move lines 18 and 19, to inside main().

[fx11]

Hi! Thanks for the answers.

My question is why does it not work in my example?

I know it works inside main().

[fx11]

I know it works inside main().

But why does it not work outside main?

[coder777]

A variable can be initialized when it is created, but it cannot be changed outside a function.

[fx11]

I think I see. Thanks.

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#include <iostream> using namespace std; int x = 10; //declaration and initialization int y; //declaration y = 20; //assignment NOT ALLOWED here int main() { cout << "x:" << x << endl; cout << "y:" << y << endl; return 0; }

error: 'y' does not name a type