Question

Create a new class MathOP2 (MathOP2.java) that Inherits from MathOP

You need to add multiply method and divide method, both methods accepts two parameters and return a value.

Create a test program with documentation to test all operators (at least 4)

The TestMathOP should do the following

     Enter the First number >> 5.5

     Enter the Second Number >> 7.5

     The sum of the numbers is 13

     The subtract of the two numbers is -2.00

     Do you want to exist (Y/N)?

        // If Yes print "Thanks for using our system"

       // If No run the program again

5) Modify the code to prompt you for the operation so it will look like this

    Enter the First number >> 5.5

      Enter the Second Number >> 7.5

      Enter operator >> +

      The answer is 13

      Do you want another operation (Y/N)?

Answer 1

TestOP code (Before modification) :

import java.util.Scanner;
public class TestMathOP {
public static void main(String args[]){
boolean status = true;
Scanner obj = new Scanner(System.in);
while(status){
System.out.println("Enter the First number >> ");
float a = obj.nextFloat();
System.out.println("Enter the Second number >> ");
float b = obj.nextFloat();
System.out.println("The sum of the numbers is "+(a+b));
System.out.println("The subtract of the two numbers is "+(a-b));
System.out.println("Do you want to exist (Y/N)");
obj.nextLine();
String yes = obj.nextLine();
if(yes.equals("Y")){
System.out.println("Thanks for using our system");
}
else{
break;
}
}
}
}

Screenshot of TestOP code :

import java.util.Scanner; public class TestMathoP ( public static void main (String args[]) boolean statustrue; scanner obj new scanner (System.in); while (status) System.out.println("Enter the First number >> ); float a obj.nextFloat System.out.printin ("Enter the Second number > m) float b obj.nextFloat ) System.out.println("The sum of the numbers is "+(atb)) System.out.println ("The subtract of the two numbers is "+(a-b)) System.out.println ("Do you want to exist (Y/N) ") obj.nextLine ); String yes = obj.nextLine(); if (yes.equals ("Y")) System.out.printin ("Thanks for using our system") elset break;
Output :

Enter the First number>> 5.5 Enter the Second number > 7.5 The sum of the numbers is 13.0 The subtract Do you want to exist (Y/N) of the two numbers is -2.0 Thanks for using our system Enter the First number>> 5.0 Enter the Second number > 7.0 The sum of the numbers is 12.0 The subtract Do you want to exist (Y/N) of the two numbers is -2.0 BUILD SUCCESSFUL (total time 13 seconds)

TestMathOP Code (After Modification ) :

import java.util.Scanner;
public class TestMathOP {
public static void main(String args[]){
boolean status = true;
Scanner obj = new Scanner(System.in);//declaring scanner object
while(status){//while true runs he loop untill break occurs
System.out.println("Enter the First number >> ");//print statement
float a = obj.nextFloat();//takes first number from user
System.out.println("Enter the Second number >> ");//print statement
float b = obj.nextFloat();//takes second number from user
obj.nextLine();//consumes input line
System.out.println("Enter operator >>");//print statement
String op = obj.nextLine();//takes input character
if(op.equals("+"))
System.out.println("The answer is "+(a+b));//prints addition value
else
System.out.println("The answer is "+(a-b));//prints value
System.out.println("Do you want to exist (Y/N)");//print statement
obj.nextLine();//to consume new line
String yes = obj.nextLine();//takes input y/n from user
if(yes.equals("Y"))//if entered choce is yes
System.out.println("Thanks for using our system");
else//else stop the loop
break;
}
}
}

Screenshot of code :

import java.util.Scanner public class TestMathOP f public static void main (String args[]) boolean statustrue Scanner obj - new Scanner (System.in)://declaring scanner object while (status)t//while true runs he loop untill break occurs System.out.println ("Enter the First number >"://print statement float a = obj.nextFloat ()://takes first number from user System.out.println ("Enter the Second number >>://print statement float b = obj.nextFloat ()://takes second number from user obj.nextLine://consumes input line System.out.println ("Enter operator >)://print statement String op = obj.nextLine(); //takes input character if (op.equals ("+")) System.out.println ("The answer is "+(a+b))://prints addition value else System.out.println ("The answer is "+(a-b))://prints value System.out.println ("Do you want to exist (Y/N) ")://print statement obj.nextLine //to consume new line String yesobj.nextLine://takes input y/n from user if (yes.equals ("Y"))//if entered choce is yes System.out.println ("Thanks for using our system") else//else stop the loop break,
OUTPUT :

Enter the First number>> 5.5 Enter the Second number > 7.5 Enter operator The answer is 13.0 Do you want to exist (Y/N)

MathOP2 Code :

import java.util.Scanner;
class MathOP{
public float MathAdd(float a,float b){//addition method
return a+b;//return statement
}
public float MathSub(float a,float b){//subtraction method
return a-b;//return statement
}
}

public class MathOP2 extends MathOP {
public float Mathmult(float a,float b){//multiplication method
return a*b;//return statement
}
public float Mathdiv(float a,float b){//division method
return a/b;//return statement
}
public static void main(String args[]){//inherits class MathOP
Scanner obj = new Scanner(System.in);//scanner object
System.out.println("Enter the First number >> ");//print statement
float a = obj.nextFloat();//takes first number from user
System.out.println("Enter the Second number >> ");//print statement
float b = obj.nextFloat();//takes second number from user
MathOP mop = new MathOP();//creating object for class MathOP
MathOP2 mop2 = new MathOP2();//creating object for class MathOP2
System.out.println(" sum is"+mop.MathAdd(a, b));//printing sum value returned from method
System.out.println(" Difference is"+mop.MathSub(a, b));//printing difference value returned from method
System.out.println(" multiplication is"+mop2.Mathmult(a, b));//printing multiplication value returned from method
System.out.println(" Division is"+mop2.Mathdiv(a, b));//printing division value returned from method
}
}

Screenshot :

import java.util.Scanner; class MathOP public float MathAdd (float a, float b)t//addition method return atb//return statement public float MathSub (float a,float b)t//subtraction method return a-b://return statement

public class MathOP2 extends MathoP i public float Mathmult (float a,float b)//multiplication method return ab//return statement public float Mathdiv (float a,float b)//division method return a/b//return statement public static void main (String args[1)//inherits class MathOP Scanner obj -new Scanner (System. in)//scanner object System.out.println("Enter the First number >>)://print statement float a = obj .nextFloat ()://takes first number from user System.out.println("Enter the Second number >")://print statement float b = obj. nextFloat ();//takes second number from user MathOP mop new MathoP/creating object for class MathoP Math0P2 mop2 = new MathOP2(); //creating object for class MathOP2 System.out.println(" sum is"+mop.MathAdd (a, b))://printing sum value returned from method System.out.println(" Difference is"+mop.MathSub (a, b)//printing difference value returned from method System.out.println(" multiplication is"+mop2. Mathmult (a, b))://printing multiplication value returned from method System.out.println(" Division is"+mop2.Mathdiv (a, b))//printing division value returned from method

Output :

Enter the Second number > 7.5 sum is13.0 Difference is-2.0 multiplication is41.25 Division is0.73333335

Note :

• MathOP2  specification is not cleared.