package oving2;

public class ArgumentStack {
	// This global variable holds the array
	// representing the argument/operand stack of the RPN calculator
	// All the methods read/write this variable

	static double [] arguments = {};
	// initialize to avoid NullPointerException!

	public static double [] copyArray (double [] original, int newSize) {
		double [] newArray = new double [newSize];
		// copy the old elements into the same positions
		System.arraycopy(original, 0, newArray, 0, Math.min (original.length, newArray.length));
		// return new array
		return newArray;
	}

	public static double peek (double d) {
		double highest;
		if(arguments.length == 0) {
			highest = d;
		}
		else {
			highest = arguments[arguments.length-1];
		}
		return highest;
	}


	public static void push (double v) {
		double[] temp;
		temp = copyArray(arguments, arguments.length+1);
		temp[temp.length-1] = v;
		arguments = temp;
	}

	public static double pop (double d) {
		double resultat;
		if (arguments.length == 0) {
			resultat = d;
		}
		else {
			double [] temp;
			temp = copyArray(arguments, arguments.length-1);
			resultat = arguments[arguments.length];
			arguments = temp;
		}
		return resultat;
	}

	// prints the arguments stack to Standard.out, with the provided
	// prefix, separator and suffix
	public static void print (String prefix, String separator, String suffix) {
		System.out.print(prefix);
		for (int i = 0; i<arguments.length; i++) {
			// make sure the separator is not printed before the first value
				if (i > 0){
				System.out.print (separator);
			}
			System.out.print(arguments[i]);
		}
		System.out.print(suffix);
	}

	public static void main (String [] args) {
	}
}