Converting a for loop to a while loop yielding different than expected results

Question

Situation:

I am trying to convert the following for loop into a while loop:

final int MIN = 1;
final int MAX = 7;
int i=MIN,j=MIN;

for(i=MIN; i<=MAX;i++)
{
    for(j=MIN;j<=MAX;j++)
    {
        if(i==j)
            if(i==(MIN+MAX)/2)
                System.out.print("o");
            else
                System.out.print("*");
        else if (i+j == MIN+MAX)
            System.out.print("*");
        else
            System.out.print(" ");
    }
    System.out.println();
}

I thought it was pretty simple:

while(i<=MAX)
{
    while(j<= MAX)
    {
        if(i==j)
            if(i==(MIN+MAX)/2)
                System.out.print("o");
            else
                System.out.print("*");
        else if (i+j == MIN+MAX)
            System.out.print("*");
        else
            System.out.print(" ");
        j++;
    }
    System.out.println();
    i++;
}

however, for some unknown reason, when i>1, it never goes into the inner while loop. i'm not sure what i'm doing wrong...

Use braces (even when they're optional)!

Elliott Frisch
– Elliott Frisch

2019-06-16 00:52:40 +00:00
Commented Jun 16, 2019 at 0:52 — Elliott Frisch
– Elliott Frisch, Commented Jun 16, 2019 at 0:52

bakero98 · Accepted Answer · 2019-06-16 00:44:28Z

2

Every time for loop start it gives j value of MIN. While loop doesn't so you have to replace value after cirtucs of loop. If you did not declare j-MIN; before inner loop, after fist inner loop iteration j would be 8 so it is not <=8

 public static void main(String []args){
    final int MIN = 1;
    final int MAX = 7;
    int i=MIN,j=MIN;

    while(i<=MAX)
    {
        j=MIN;  //ADDED
        while(j<= MAX)
        {
            if(i==j)
                if(i==(MIN+MAX)/2)
                    System.out.print("o");
                else
                    System.out.print("*");
            else if (i+j == MIN+MAX)
                System.out.print("*");
            else
                System.out.print(" ");
            j++;
        }
        System.out.println();
        i++;
    }
    }

edited Jun 16, 2019 at 0:44

answered Jun 16, 2019 at 0:33

bakero98

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