Topic       : Pure C Library Documentation
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View Ref-File[ isalpha ]

#include <ctype.h>

int isalpha( int c );

  <c> is a character (0-255) passed as an int.


It returns TRUE if character <c> is a letter in the alphabet
  ('A' to 'Z' or 'a' to 'z').

See also Character Type and ASCII Character Set.