for loop question

[calmchess]

lets say i have a for loop and within that for loop I want 1 action to happen on the odd iterations and a diffrent one to happen on the even iterations. How would I write such a for loop?

 

for(i=0; i<length; i++){

 

if odd

 

if even

}

[Psycho]

Use the modulus operator:

Use the modulus operator:

for(i=0; i<length; i++)
{
   if(i%2)
   {
      //Even code
   }
   else
   {
      //Odd code
   }
}

 

 

In case you are not familiar with modulus, it is the mathematical operator to get the remainder of a division. Do, the modulus of 11 divided by 3 would be 2:

 

11 / 3 = 3 (3 x 3 = 9) with a remainder of 2.

 

So, the modulus of 2 as i increases will alternate between 1 and 0 (no remainder). Since 1 and 0 are interpreted as the logical true/false you can just use the result of the modulus in the if statement rather than

if(i%2 == 1)

Edited February 11, 2013 by Psycho

[calmchess]

thank you very much