int ft_isalpha(int c)
헤더 #include <ctype.h> 형태 int isalpha(int c)
#include <ctype.h>
int isalpha(int c)
int ft_isalpha(int c) { if ((c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z')) return (1); return (0); }