// purpose: represent a simple calculator

public class Calculator {

	// attribute
	int runningTotal;

	// Calculator(): configures the running total to 0
	public Calculator() {
	}

	// Calculator(): configures the running total to a given start value
	public Calculator( int startValue ) {
	}

	// add(): increments the running total by n
	public void add( int n ) {
	}

	// subtract(): decrements the running total by n
	public void subtract( int n ) {
	}

	// multiply(): scales the running total by n
	public void multiply( int n ) {
	}

	// divide(): if n is nonzero, divides running total by n.
	public void divide( int n ) {
	}

	// reset(): sets the running total to 0
	public void reset() {
	}

	// equals(): test whether other calculator matches
	public boolean equals( Calculator other ) {
		return false;
	}

	// set(): sets the running total to n
	public void set( int n ) {
		this.runningTotal = n;
	}

	// value(): gives the current running total of the calculator
	public int value () {
		return this.runningTotal;
	}

	// toString(): produces a text representation of the running total
	public String toString() {
		String representation = "" + this.value();

		return representation;
	}

	// equals(): tests whether there is a matching calculator
	public boolean equals( Object other ) {
		if ( other instanceof Calculator ) { 
			return this.equals( (Calculator) other );
		}
		else {
			return false;
		}
	}

	// clone(): return a new Calculator duplicating the calculator
	public Object clone() {
		int n = this.value();

		Calculator c = new Calculator( n );

		return c;
	}
}