//Note : //to run this program go to : // run > run configurations > arguments > // 4 + 2 // or use the terminal to compile package for_testing; public class sandbox{ public static void main(String[] args) { Double number1 = Double.parseDouble(args[0]); Double number2 = Double.parseDouble(args[2]); //addition if (args[1].equals("+")) { System.out.println(args[0]+args[1]+args[2]+"=" + (number1+number2)); } //subtraction if (args[1].equals("-")) { System.out.println(args[0]+args[1]+args[2]+"=" + (number1-number2)); } //division if (args[1].equals("/")) { System.out.println(args[0]+args[1]+args[2]+"=" + (number1/number2)); } //multiplication // we use the letter x instead of * if (args[1].equals("x")) { System.out.println(args[0]+args[1]+args[2]+"=" + (number1*number2)); } } }