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Calculator.java
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Calculator.java
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import java.io.*;
import java.util.Scanner;
class Calculator{
public static void main(String[] args) {
String operator;
char type;
//Double number1, number2, result;
// create an object of Scanner class
Scanner sc = new Scanner(System.in);
Scanner input = new Scanner(System.in);
// ask users to choose the type of operator
System.out.println("Choose the type of operator : \n(1) Arithmetic \n(2) Logical \n(3) Relational ");
type = input.next().charAt(0);
if (type == '1'){
Double number1, number2, result;
// ask users to enter operator
System.out.println("Choose an operator : +, -, *, /");
operator = sc.nextLine();
// ask users to enter numbers
System.out.println("Enter first number");
number1 = input.nextDouble();
System.out.println("Enter second number");
number2 = input.nextDouble();
switch (operator) {
// performs addition between numbers
case "+":
result = number1 + number2;
System.out.println(number1 + " + " + number2 + " = " + result);
break;
// performs subtraction between numbers
case "-":
result = number1 - number2;
System.out.println(number1 + " - " + number2 + " = " + result);
break;
// performs multiplication between numbers
case "*":
result = number1 * number2;
System.out.println(number1 + " * " + number2 + " = " + result);
break;
// performs division between numbers
case "/":
result = number1 / number2;
System.out.println(number1 + " / " + number2 + " = " + result);
break;
default:
System.out.println("Invalid operator!");
break;
}
}
if (type == '2'){
boolean number1, number2, result;
// ask users to enter operator
System.out.println("Choose an operator : &&, ||, !");
operator = sc.nextLine();
// ask users to enter numbers
System.out.println("Enter first value (true/false)");
number1 = input.nextBoolean();
switch (operator) {
// performs addition between numbers
case "&&":
System.out.println("Enter second value (true/false)");
number2 = input.nextBoolean();
result = number1 && number2;
System.out.println(number1 + " && " + number2 + " = " + result);
break;
// performs subtraction between numbers
case "||":
System.out.println("Enter second value (true/false)");
number2 = input.nextBoolean();
result = number1 || number2;
System.out.println(number1 + " || " + number2 + " = " + result);
break;
// performs multiplication between numbers
case "!":
result = !number1;
System.out.println("!" + number1 + " = " + result);
break;
default:
System.out.println("Invalid operator!");
break;
}
}
if (type == '3'){
Double number1, number2;
boolean result;
// ask users to enter operator
System.out.println("Choose an operator : ==, !=, >, <, >=, <=");
operator = sc.nextLine();
// ask users to enter numbers
System.out.println("Enter first number");
number1 = input.nextDouble();
System.out.println("Enter second number");
number2 = input.nextDouble();
switch (operator) {
// performs addition between numbers
case "==":
result = (number1 == number2);
System.out.println(number1 + " == " + number2 + " -> " + result);
break;
// performs subtraction between numbers
case "!=":
result = (number1 != number2);
System.out.println(number1 + " != " + number2 + " -> " + result);
break;
// performs multiplication between numbers
case ">":
result = (number1 > number2);
System.out.println(number1 + " > " + number2 + " -> " + result);
break;
// performs division between numbers
case "<":
result = (number1 < number2);
System.out.println(number1 + " < " + number2 + " -> " + result);
break;
case ">=":
result = (number1 >= number2);
System.out.println(number1 + " >= " + number2 + " -> " + result);
break;
case "<=":
result = (number1 <= number2);
System.out.println(number1 + " <= " + number2 + " -> " + result);
break;
default:
System.out.println("Invalid operator!");
break;
}
}
input.close();
}
}