Java (Find the future date with if else statements)

Question

I have a question that I can\'t figure it out , Thank you: Write a program that prompts the user to enter an integer for today\'s day of the week (Sunday is 0 ,Monday is 1 ,

Answer 1

As I know, this question is from the book "Introduction To Java Programming". Where this question is asked, you don't have any knowledge of methods, loops, arrays etc. so I will just use Selections.

Here, when I tried to solve with a better way, I could not find any since we cannot use arrays which could be very helpful or methods which is even better. That's why this question is a little redundant in book.

And you really should not use if statements because switch is much better in this case.

    System.out.println("Enter today's number (0 for Sunday, 1 for Monday...) :");
    int todayNo = in.nextInt();

    System.out.println("Enter the number of days elapsed since today:");
    int elapsedDay = in.nextInt();

    int futureDay = (todayNo + elapsedDay) % 7;

    switch (todayNo) {
        case 0:
            System.out.print("Today is Sunday and");
            break;
        case 1:
            System.out.print("Today is Monday and");
            break;
        case 2:
            System.out.print("Today is Tuesday and");
            break;
        case 3:
            System.out.print("Today is Wednesday and");
            break;
        case 4:
            System.out.print("Today is Thursday and");
            break;
        case 5:
            System.out.print("Today is Friday and");
            break;
        case 6:
            System.out.print("Today is Saturday and");
            break;

    }

    switch (futureDay) {
        case 0:
            System.out.print(" the future day is Sunday.");
            break;
        case 1:
            System.out.print(" the future day is Monday.");
            break;
        case 2:
            System.out.print(" the future day is Tuesday.");
            break;
        case 3:
            System.out.print(" the future day is Wednesday.");
            break;
        case 4:
            System.out.print(" the future day is Thursday.");
            break;
        case 5:
            System.out.print(" the future day is Friday.");
            break;
        case 6:
            System.out.print(" the future day is Saturday.");
            break;

    }

Here, the only thing that you maybe don't know is System.out.print();. The only difference with the System.out.println(); is with this method, this one doesn't print on a new line, it prints on the same line which is what we need here. Tinker with it to understand better.