cwh_103_custom_calc.java

package javatutorial;

class InvalidInputException extends Exception{
	@Override 
	public String toString() {
		return "Cannot add 8 and 9";
	}
	
	@Override
	public String getMessage() {
		return "I am getMessage()" ;
	}
	
}

class CannotDivideByZeroException extends Exception{
	@Override 
	public String toString() {
		return "Cannot divide by 0";
	}
	
	@Override
	public String getMessage() {
		return "I am getMessage()" ;
	}
	
}
class MaxInputException extends Exception{
	@Override 
	public String toString() {
		return "number cannot be greater than 100000";
	}
	
	@Override
	public String getMessage() {
		return "I am getMessage()" ;
	}
	
}
class MaxMultiplyInputException extends Exception{
	@Override 
	public String toString() {
		return "Input cant be greater than 7000 while multiplying";
	}
	
	@Override
	public String getMessage() {
		return "I am getMessage()" ;
	}
	
}

class CustomCalculator {
double add(double a, double b)throws InvalidInputException, MaxInputException{
	
	if(a>100000 || b>100000) {
		throw new MaxInputException();
	}
	
	if (a==8 || b==9) {
		
		throw new InvalidInputException();
	}
	 return a+b;
	 
	}
	
	double subtract(double a, double b) throws MaxInputException {
		
		if(a>100000 || b>100000) {
			throw new MaxInputException();
		}
		
		return a-b;
	}
	
	double multiply(double a, double b) throws MaxInputException, MaxMultiplyInputException {
		if(a>100000 || b>100000) {
			throw new MaxInputException();
		} 
		else if (a>7000 || b>7000) {
			throw new MaxMultiplyInputException();
		}
		
		return a*b;
	}
	
	double divide(double a, double b) throws CannotDivideByZeroException, MaxInputException {
		
		if(a>100000 || b>100000) {
			throw new MaxInputException();
		}
		else if(b==0) {
			throw new CannotDivideByZeroException();
		}
		return a/b;
	}
}

public class cwh_103_custom_calc {
	
	public static void main(String[] args) throws InvalidInputException, CannotDivideByZeroException, MaxInputException , MaxMultiplyInputException {
		
		CustomCalculator c = new CustomCalculator();
		//c.add(8, 9);  // 1.
		//c.divide(6, 0); // 2.
		//c.divide(6000000, 40);//  3.
		c.multiply(5, 9000);  // 4.
		
		
		
		
		
		
		/*
		  /*
        Exercise 6: You have to create a custom calculator with following operations:
        1. + -> Addition
        2. - -> Subtraction
        3. * -> Multiplication
        4. / -> Division
        which throws the following exceptions:
        1. Invalid input Exception ex: 8 & 9
        2. Cannot divide by 0 Exception
        3. Max Input Exception if any of the inputs is greater than 100000
        4. Max Multiplier Reached Exception - Don't allow any multiplication input to be greater than 7000 
		 
		 */
		
	}

}