parseint not defined for char.

[cagyul]

Thank you for your comments. I have just read Harper and it helps in 
understanding the theoretical side of the matter. But I still don't know what 
static type I should use to replace strings (pre-defined arrays of characters 
?). I have Sedwick (Pascal examples) and will re-consult it but only after 
reading Erickson, which is unknown to me.