// Assignment statement.
    counter = 1;

    // Error! This is an expression, not an expression statement.
    // counter + 1;

    // Declaration statements with initializers are functionally
    // equivalent to  declaration statement followed by assignment statement:
    int[] radii = { 15, 32, 108, 74, 9 }; // Declare and initialize an array.
    const double pi = 3.14159; // Declare and initialize  constant.

    // foreach statement block that contains multiple statements.
    foreach (int radius in radii)
    {
        // Declaration statement with initializer.
        double circumference = pi * (2 * radius);

        // Expression statement (method invocation). A single-line
        // statement can span multiple text lines because line breaks
        // are treated as white space, which is ignored by the compiler.
        System.Console.WriteLine("Radius of circle #{0} is {1}. Circumference = {2:N2}",
                                counter, radius, circumference);

        // Expression statement (postfix increment).
        counter++;
    } // End of foreach statement block
} // End of Main method body.