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Calculator.java
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Calculator.java
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// I used this program to practice Java syntax with 'for' loops
// the 'case' command and unique Java 'printf()' statements.
import java.util.Scanner;
public class Calculator {
public void multiple() {
// 'printf' example:
System.out.println("Multiples of '9'");
for(int i=1; i<=10; i++)
System.out.printf("%2d * %1d = %2d\n",i,9,i*9); // Java can do math within a for loop with minimal typing
}
public static void main(String[] args) {
double num1, num2;
Scanner scanner = new Scanner(System.in);
System.out.print("Enter first number: ");
num1 = scanner.nextDouble();
System.out.print("Enter second number: ");
num2 = scanner.nextDouble();
System.out.print("Enter an action: '+' '-' '*' '/' >");
char operator = scanner.next().charAt(0);
scanner.close();
double output;
switch(operator){
case '+':
output = num1 + num2;
break;
case '-':
output = num1 - num2;
break;
case '*':
output = num1 * num2;
break;
case '/':
output = num1 / num2;
break;
default:
System.out.printf("Invalid input...");
return;
}
System.out.println(num1+" "+operator+" "+num2+" = "+output);
Calculator nine = new Calculator();
nine.multiple();
}
}