not getting expected result - array loop

Question

ok, so this is in ActionScript 3, my problem is here:

var numCols:uint = 7;
numRows:uint = 7;

row = 1;
column = 3;

total = row+column-1    
for(i = 0; i < numRows; i++){
    for(j = 0; j < numCols; j++){
        if(j < column){
            array[i][j]=total--
        }else{
            array[i][j]=total++                     
        }
    }
}

I am expecting this result in array:

3,2,1,2,3,4....

However I get this:

3,2,1,0,1,2,3,4...

Unless you put the value of the 2-dimensional array, it's difficult to say where the problem is. — Vladimir Tsvetkov
– Vladimir Tsvetkov, Commented Nov 7, 2011 at 13:10
do you want to know the values before I try to run this code? — dgamma3
– dgamma3, Commented Nov 7, 2011 at 13:13
Yes, otherwise how should I know what the code fragment is supposed to do? — Vladimir Tsvetkov
– Vladimir Tsvetkov, Commented Nov 7, 2011 at 13:20

Lieven Keersmaekers · Accepted Answer · 2011-11-07 13:25:46Z

1

Problem

Your condition

if (j < column)

evaluates to true three times.

1. column = 3, j = 0, total = 3, total becomes 2
2. column = 3, j = 1, total = 2, total becomes 1
3. column = 3, j = 2, total = 1, total becomes 0

the fourth time, the else clause gets executed but by this time, your total has dropped to 0.

4. column = 3, j = 3, total = 0, total becomes 1.

Possible solution

I don't know your use case but changing

array[i][j]=total++

to

array[i][j]=++total

could be all it takes.

edited Nov 7, 2011 at 13:25

answered Nov 7, 2011 at 13:20

Lieven Keersmaekers

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