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int isalnum(int c);
int isalpha(int c);
int isblank(int c);
int iscntrl(int c);
int isdigit(int c);
int isgraph(int c);
int islower(int c);
int isprint(int c);
int ispunct(int c);
int isspace(int c);
int isupper(int c);
int isxdigit(int c);
int tolower(int c);
int toupper(int c);
int main()
{
assert(isalnum('a'));
assert(isalnum('1'));
assert(isalnum('A'));
assert(isalnum('G'));
assert(!isalnum(' '));
assert(!isalnum('.'));
assert(!isalnum(0));
assert(isalpha('a'));
assert(!isalpha('1'));
assert(isalpha('A'));
assert(isalpha('G'));
assert(!isalpha(' '));
assert(!isalpha('.'));
assert(!isalpha(0));
assert(!isblank('a'));
assert(!isblank('1'));
assert(!isblank('A'));
assert(!isblank('G'));
assert(isblank(' '));
assert(!isblank('.'));
assert(!isblank(0));
assert(!iscntrl('a'));
assert(!iscntrl('1'));
assert(!iscntrl('A'));
assert(!iscntrl('G'));
assert(!iscntrl(' '));
assert(!iscntrl('.'));
assert(iscntrl(0));
assert(!isdigit('a'));
assert(isdigit('1'));
assert(!isdigit('A'));
assert(!isdigit('G'));
assert(!isdigit(' '));
assert(!isdigit('.'));
assert(!isdigit(0));
assert(islower('a'));
assert(!islower('1'));
assert(!islower('A'));
assert(!islower('G'));
assert(!islower(' '));
assert(!islower('.'));
assert(!islower(0));
assert(!isupper('a'));
assert(!isupper('1'));
assert(isupper('A'));
assert(isupper('G'));
assert(!isupper(' '));
assert(!isupper('.'));
assert(!isupper(0));
assert(!isspace('a'));
assert(!isspace('1'));
assert(!isspace('A'));
assert(!isspace('G'));
assert(isspace(' '));
assert(!isspace('.'));
assert(!isspace(0));
assert(tolower('a')=='a');
assert(tolower('1')=='1');
assert(tolower('A')=='a');
assert(tolower('G')=='g');
assert(tolower(' ')==' ');
assert(tolower('.')=='.');
assert(tolower(0)==0);
assert(toupper('a')=='A');
assert(toupper('1')=='1');
assert(toupper('A')=='A');
assert(toupper('G')=='G');
assert(toupper(' ')==' ');
assert(toupper('.')=='.');
assert(toupper(0)==0);
}
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