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nextAlpha returns the character code of the alphabetically next character (same case) after that with character code char. It is undefined if char is not the character code for one of the lowercase letters a through y or for one of the uppercase letters A through Y.
Example 42–16. Use of nextAlpha
| nextAlpha('y') = 'z' nextAlpha('M') = 'N' nextAlpha('Z') is undefined |
MAINSAIL Language Manual, Section 42.11