if the index is an even number

[SNN]

Hi all ,

I have loop and I would like to calculate an expression only when the index is even

for($j=0; $j<=100; $j++){

if ( ){
do the expression
}
}
i.e how do I tell perl to do the if statement when $j is an even number?

Thanks

[katharnakh]

for($j=0; $j<=100; $j++){ 
<do the expression> unless($j%2);
}

If you are doing some mathematical operation with the expression i think you want to re-check whether loop should start from 0.

katharnakh.

[KevinADC]

If you want to process the even number indices of an array:

for (my $i = 0; $i <= $#array; $i+=2) {