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#include <ctype.h>
int isalpha(int c) {
return islower(c) || isupper(c);
}
int isalnum(int c) {
return isalpha(c) || isdigit(c);
}
int isdigit(int c) {
return '0' <= c && c <= '9';
}
int islower(int c) {
return 'a' <= c && c <= 'z';
}
int isspace(int c) {
return c == ' '
|| c == '\f'
|| c == '\n'
|| c == '\r'
|| c == '\t'
|| c == '\v';
}
int isupper(int c) {
return 'A' <= c && c <= 'Z';
}
int tolower(int c) {
if (isupper(c)) return c - 'A' + 'a';
return c;
}
int toupper(int c) {
if (islower(c)) return c - 'a' + 'A';
return c;
}
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