MOVE COMP-DATA TO HLD-CHAR
MOVE HLD-CHAR TO FINAL-CHAR
Comp, Comp-1, comp-2, comp-3 . All are used for Numeric calculations.
To increase the performance of the compiler these Comp variables are used which will work dynamically. There won't be necessary for alpanumeric or alphabets manipulations. If at all you use means it will cause errors. Systems may hangup sometimes.