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Module: Prelude
Function: pred
Type: Enum a => a -> a
Class: Enum
Description: returns preceding item in an enumeration (integers and characters in the following examples).
Related: enumFrom, enumFromThen, enumFromThenTo, enumFromTo, fromEnum, succ, toEnum

Example 1

Input: pred 5

Output: 4

Example 2

Input: pred 'B'

Output: 'A'

Example 3
Program source: 
data XXX = AA|BB|CC|DD deriving (Enum, Show)

Input: pred BB

Output: AA