Question

Language: Java(Netbeans)

Implement a simple calculator.

Answer 1

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Source code:

import java.util.Scanner;

public class Main {

public static void main(String[] args) {

Scanner sc = new Scanner(System.in);
System.out.print("Enter two numbers: ");

// nextDouble() reads the next double from the keyboard
double num1 = sc.nextDouble();
double num2 = sc.nextDouble();

System.out.print("Enter an operator (+, -, *, /): ");
  
char operator = sc.next().charAt(0);

double result;

switch(operator) // switch cases for the calculator operations
{
case '+':
result = num1 + num2;
break;

case '-':
result = num1 - num2;
break;

case '*':
result = num1 * num2;
break;

case '/':
result = num1 / num2;
break;

// operator doesn't match any case constant (+, -, *, /)
default:
System.out.printf("Error! operator is not correct");
return;
}

System.out.printf("%.1f %c %.1f = %.1f", num1, operator, num2, result);
}
}

output 1

Enter two numbers: 7
4
Enter an operator (+, -, *, /): -
7.0 - 4.0 = 3.0

output2:

Enter two numbers: 8
56
Enter an operator (+, -, *, /): +
8.0 + 56.0 = 64.0

output 3:

Enter two numbers: 45
6
Enter an operator (+, -, *, /): /
45.0 / 6.0 = 7.5

output 4:

Enter two numbers: 12
8.3
Enter an operator (+, -, *, /): *
12.0 * 8.3 = 99.6