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#include <ctype.h>
int isalpha(int c) {
return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
}
int isdigit(int c) {
return (c >= '0' && c <= '9');
}
int isalnum(int c) {
return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z') || (c >= '0' && c <= '9');
}
int tolower(int c) {
if (c >= 'A' && c <= 'Z') {
c += ('a' - 'A');
}
return c;
}
int toupper(int c) {
if (c >= 'a' && c <= 'z') {
c -= ('a' - 'A');
}
return c;
}
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