6. int x = 2;
int y = 3;
System.out.println("x + y = " + sum(x, y));
System.out.println("10 + 20 = " + sum(10, 20));
}
7. private static void sayWelcome () {
System.out.println("Welcome to Calculator Program");
}
private static int sum (int a, int b) {
return a + b;
}
}