Converting a character value into a numeric value

How do I convert a character value into numeric value within a CL program? Just use the chgvar command as this...

example illustrates. Just make sure that your alpha value does contain all numbers.

 
PGM                                                                 
             DCL        VAR(&ALPHA) TYPE(*CHAR) LEN(3) VALUE('003') 
             DCL        VAR(&NUM) TYPE(*DEC) LEN(3 0)               
             CHGVAR     VAR(&NUM) VALUE(&ALPHA)                     
ENDPGM         

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