Question

Define a class Calculate to accept two numbers as instance variables. Use the following member methods for the given purposes: 

Class name: Calculate
Data members: int a, int b
Member methods:
void inputdata(): to input both the values
void calculate(): to find sum and difference
void outputdata(): to print sum and difference of both the numbers.

Use a main method to call the functions. 

Answer 1

import java.util.*;
class Calculate{ 
double a, b, sum, diff;

void inputdata()
{Scanner ob = new Scanner(System.in);
System.out.printIn("Enter the two numbers");
a = ob.nextDouble();
b = ob.nextDouble();
}

void calculate() // This is a method, not a constructor
{sum = a + b;
diff = a - b;
}
void outputdata()
{System.out.println("Sum = " + sum);
System.out.printIn("Difference = " + diff);
}

public static void main(String jkp[])
{Calculate ob = new Calculate();
ob.inputdata();
ob.calculate();
ob.outputdata();
}}