Multiple variables in a for loop

Question

          else
    {
        r=Power(s,n-1);
        System.out.println(r);
        int d=r.length;
        char ch=s.charAt(n);
        int v=d+1;
        p[v]=Character.toString(ch);
        String q = p[v];

        for(i=d+2,j=0;i<2d+3,j<d;i++,j++)
        {
            p[i]=r[j].concat(q);
        }
}

A syntax error is shown and var j is not recognized even after declaration... pls help me.

If a syntax error is shown, then your program cannot run at all. You need to fix the syntax error first. — Esailija
– Esailija, Commented Oct 27, 2012 at 12:18
I don't see the declaration of j; Just place an int j; before the for loop — Eduardo
– Eduardo, Commented Oct 27, 2012 at 12:18
by the way, i seems to not have been declared either. you might need to change i=d+2 to int i=d+2 — Eduardo
– Eduardo, Commented Oct 27, 2012 at 12:22

Renato Lochetti · Accepted Answer · 2012-10-27 12:31:40Z

22

The problem is the condition of the loop. The correct should be:

for(i=d+2,j=0;i<2d+3 && j<d;i++,j++){ ...

or

for(i=d+2,j=0;i<2d+3 || j<d;i++,j++){ ...

There is no meaning in putting a comma separating two boolean conditions in java.

And as seen in the comments, variables j and i are not declared.

edited Oct 27, 2012 at 12:31

answered Oct 27, 2012 at 12:23

Renato Lochetti

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1 Comment

Eduardo Over a year ago

Good catch! I can't remember if Java was like C regarding the comma operator, where cond1, cond2 would yield the same result as writing cond2(assuming cond1 has no side-effects, of course, like in this case).

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