Variable Number of Parameters - D Programming Language

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# Variable Number of Parameters

#### Variable Number of Parameters Dersi Problem Çözümleri

For the `calculate()` function to be able to take variable number of parameters, its parameter list must include a slice of `Calculation` followed by `...`:

    double[] calculate(Calculation[] calculations...) {
        double[] results;

        foreach (calculation; calculations) {
            final switch (calculation.op) {

            case Operation.add:
                results ~= calculation.first + calculation.second;
                break;

            case Operation.subtract:
                results ~= calculation.first - calculation.second;
                break;

            case Operation.multiply:
                results ~= calculation.first * calculation.second;
                break;

            case Operation.divide:
                results ~= calculation.first / calculation.second;
                break;
            }
        }

        return results;
    }

Each calculation is evaluated inside a loop and their results are appended to a slice of type `double[]`.

Here is the entire program:

    import std.stdio;

    enum Operation { add, subtract, multiply, divide }

    struct Calculation {
        Operation op;
        double first;
        double second;
    }

    double[] calculate(Calculation[] calculations...) {
        double[] results;

        foreach (calculation; calculations) {
            final switch (calculation.op) {

            case Operation.add:
                results ~= calculation.first + calculation.second;
                break;

            case Operation.subtract:
                results ~= calculation.first - calculation.second;
                break;

            case Operation.multiply:
                results ~= calculation.first * calculation.second;
                break;

            case Operation.divide:
                results ~= calculation.first / calculation.second;
                break;
            }
        }

        return results;
    }

    void main() {
        writeln(calculate(Calculation(Operation.add, 1.1, 2.2),
                          Calculation(Operation.subtract, 3.3, 4.4),
                          Calculation(Operation.multiply, 5.5, 6.6),
                          Calculation(Operation.divide, 7.7, 8.8)));
    }

The output:

    [3.3, -1.1, 36.3, 0.875]

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