public class CalculatorInteger
{ private int CurrentValue;

  public CalculatorInteger()
  { CurrentValue = 0;
  }

  public CalculatorInteger( int InitialValue )
  { CurrentValue = InitialValue;
  }

  public void Multiply( int Value )
  { // CurrentValue = CurrentValue * Value;
    int Result;
    boolean IsNegative = false;
    if(Value < 0) 
    { IsNegative = true;
      Value = 0 - Value;
    }
    for(int i = 0; i < Value; i++)
    { Result = Result + CurrentValue;
    }
    
    if( IsNegative ) Result = 0 - Result;

   CurrentValue = Result;
  }


}

import java.util.*;
public class Calculator {

	// All of your code goes here
	
	private int CurrentValue;
	
	public Calculator(){
		
		CurrentValue = 0;
		
	}
	
	public Calculator(int initialValue){
	
		CurrentValue = initialValue;
		
	}
	
    public void clear(){
		//Resets the running total to 0
    	
    	CurrentValue = 0;
	}
	
    public void add(int value){
    	//Adds value to running total
    	
    	for(int i =0; i<value; i++){
    		CurrentValue++;
    	}
    }
	public void subtract(int value){
		//Subtracts value from the running total
		
		for(int i =0; i<value; i++){
    		CurrentValue--;
    	}
	}
	
	public void multiply(int value){
		
		{	// Multiplies running total by value.
			// CurrentValue = CurrentValue * Value;
			
		    int Result = 0;
		    boolean IsNegative = !((value>0)&&(CurrentValue>0));
		    if(value < 0) 
		    { IsNegative = true;
		      value = 0 - value;
		    }
		    for(int i = 0; i < value; i++)
		    { Result = Result + CurrentValue;
		    }
		    
		    if(IsNegative) Result = 0 - Result;

		    CurrentValue = Result;
		}
	
	}
	public void divide(int value){
		//Divides running total by value, generating an integer result. Checks if value is 0, if so, prints error
		boolean isNegative = !((value>0)&&(CurrentValue>0));
		boolean bothNegative = ((value<0)&&(CurrentValue<0));
		if(value == 0){
			System.out.println("Error!");
			return;
		}
		if(Math.abs(value)>Math.abs(CurrentValue)){
			CurrentValue = 0;
		}
		else{
			if(isNegative){
				if(value<0){
					value = 0 - value;
				}
				if(CurrentValue<0){
					CurrentValue = 0 -CurrentValue;
				}
			}
			int quotient = 0;
			while(CurrentValue>=value){
				CurrentValue-= value;
				quotient++;
			}
			CurrentValue = quotient;
		}
		if(isNegative&&!bothNegative){
			CurrentValue = 0 - CurrentValue;
		}
	}

	public void power(int pow){

	    //Raises running total to the power of pow. If pow is 0, running total is set to 1.
		boolean isNegative = CurrentValue < 0;
		if(pow==0){
			CurrentValue = 1;
		}
		else if(pow ==1){
			CurrentValue = CurrentValue;
		}
		else if(pow<0){
			System.out.println("Error!");
		}
		else{
			if(isNegative){
				CurrentValue = 0 - CurrentValue;
			}
			int index = CurrentValue;
			for(int i =1; i<pow; i++){
				this.multiply(index);
			}
		}
		if((pow%2==1)&&(isNegative)){
			CurrentValue = 0 - CurrentValue;
		}
	}
	
	public int getTotal(){
		//Returns current value of the running total
		
		return CurrentValue;
    
	}
	
		
}