A small calculator

Time to put the operators together. A calculator program reads two numbers and prints one line per operation:

Scanner scanner = new Scanner(System.in);
int a = Integer.valueOf(scanner.nextLine());
int b = Integer.valueOf(scanner.nextLine());
System.out.println(a + " + " + b + " = " + (a + b));
System.out.println(a + " / " + b + " = " + ((double) a / b));

7
2

7 + 2 = 9
7 / 2 = 3.5

Two details make it right:

• Each calculation is in parentheses, so it happens before the joining.
• The division casts to double, so 7 / 2 shows 3.5 and not 3.