How to write a nested if statement within a Do-While Loop?

Question

I am a beginner Java student. This is the general idea of what I'm doing.

I have a list of things that a user can pick from by inputting the corresponding number. After they input ONE integer, the string next to the item prints as YES. If they decide they don't want it anymore, they have to input that same number again and then string is supposed to change to NO. My nested loop technique is allowing for this change, but changes it right back after reading the next if statement. I have been working on this for a very long time. Can anyone please nudge me in the right direction to identify this problem?

     do
    {
        int num=input.nextInt();  

        if (num == 7)
        {               
            if(s.equals("NO"))  //corresponding string
            {
               s = "YES";
            }
            if(s.equals("YES"))  //same corresponding string
            {
               s = "NO";
            }
        }

    //similar if statements for different conditions 
    //similar if statements for different conditions 


    }while(myBoolean()==true);

Use an else if block. if (something) {...} else if (something else) {...} Your code is missing the else I think. — Hovercraft Full Of Eels
– Hovercraft Full Of Eels, Commented Jul 4, 2014 at 17:56

Hovercraft Full Of Eels · Accepted Answer · 2014-07-04 17:57:26Z

1

You seem to be missing an else statement.

if(s.equals("NO"))  //corresponding string
{
   s = "YES";
} else if(s.equals("YES"))  //same corresponding string
{
   s = "NO";
}

or if you want to shorten things a bit:

s = s.equalsIgnoreCase("NO") ? "YES" : "NO";

answered Jul 4, 2014 at 17:57

Hovercraft Full Of Eels

286k25 gold badges268 silver badges391 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Logicrat · Accepted Answer · 2014-07-04 18:18:31Z

0

 do
{

Just add the word "else" in between your "if" statements. In your example, when s is "NO", you change it to "YES". Therefore s is "YES" when you hit your second "if" statement.

Better yet, instead of testing for both values "YES and "NO", just test for one of them and assume the opposite case if the test fails.

E.g.: do { int num=input.nextInt();

    if (num == 7)
    {               
        if(s.equals("NO"))  //corresponding string
        {
           s = "YES";
        }
        else  // <--- This is the only change I made.
        {
           s = "NO";
        }
    }

//similar if statements for different conditions 
//similar if statements for different conditions 


}while(myBoolean()==true);

answered Jul 4, 2014 at 18:18

Logicrat

4,46819 silver badges24 bronze badges

1 Comment

user3806226 Over a year ago

wow that was so simple! thank you very much! but now for some reason i have to input a number twice before it loops again...do you think something is wrong with my boolean?

TFischer · Accepted Answer · 2014-07-04 17:58:04Z

0

What you should do is use an else if statement like so

if (num == 7)
{               
    if(s.equals("NO"))
    {
       s = "YES";
    }
    else if(s.equals("YES"))
    {
       s = "NO";
    }
}

If the first if statement is true, it will skip the else if statement. If the if statement is false, it will read the else if statement. You can also have multiple else if statements like so

if(boolean)
{
   ....
}
else if(another boolean)
{
   ....
}
else if(some other boolean)
{
   ....
}

If the if statement and all else if statements are false, you can add an else statement, which will be read

if(boolean)
{
   ....
}
else if(another boolean)
{
   ....
}
else
{
   ....
}

answered Jul 4, 2014 at 17:58

TFischer

1,3882 gold badges25 silver badges46 bronze badges

1 Comment

user3806226 Over a year ago

Thank you! The problem now is that it works for changing it from yes to no, but then I can't change it back to yes again without restarting the program

Collectives™ on Stack Overflow

How to write a nested if statement within a Do-While Loop?

3 Answers 3

Comments

1 Comment

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

1 Comment

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related