ok, 1st you set up an array of int with  {4, 14, 11, 100, 6}

see here plaese:
http://www.processing.org/reference/Array.html


then have

1. int C = 12;

ok and then for-loop through the array and use
if to compare it to C - when it is smaller use println to print it.*

See

http://www.processing.org/reference/

for all these words for, if and println....



*It's a little more complicate than this, you'll end up with 6 and not 11 but give it a go...