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prevAlpha returns the character code of the alphabetically previous character (same case) to that with character code char. It is undefined if char is not the character code for one of the lowercase letters b through z or for one of the uppercase letters B through Z.
Example 44–11. Use of prevAlpha
| prevAlpha('z') = 'y' prevAlpha('b') = 'a' prevAlpha('B') = 'A' prevAlpha('A') is undefined |
MAINSAIL Language Manual, Section 44.12