Question

Task 6: Write a Java program to make a calculator. The calculator should add, subtract, multiply and divide the numbers inserted by the user. Feel free to add more operations to your calculator, such as power, sqrt etc. (Hint: Use Switch)

Answer 1

import java .util .Scanner ;

public class Calculator {

public static void main (String [ ] args){

Scanner reader = new Scanner ( System .in);

System.out.print("Enter two numbers :");

double first = reader .nextDouble();

dohble second = reader .nextDouble();

System.out.print("Enter an operator (+,-,*,/): ");

char operator = reader. next ().charAt(0);

double result ;

Switch (operator)

{

case '+' :

result = first+ second ;

break;

case '-':

result = first-second ;

break;

case '*':

result = first*second ;

break;

case '/':

result = first/second ;

break;

default :

System.out printf("Error ! operator is not correct ");

return;

}

System.out.printf( "%. 1f %c %. 1f= %. 1f", first ,operator ,second ,result );

}

}