The ctype.h header file of the C Standard Library provides declares several functions useful for testing and mapping characters.
All the functions accepts int as a parameter, whose value must be EOF or representable as an unsigned char.
All the functions return non-zero (true) if the argument c satisfies the condition described, and zero if not
Syntax:#include
Example:#include
#include
#include
#include
void main() {
int test;
char *ans[2] = {" not ", ""};
for (test = -1; test < 256; test++)
{
printf("\n\n\nthe value %02x is:\n",
test);
printf("%salphanumeric\n",
ans[(isalnum(test) != 0)]);
printf("%sa letter\n",
ans[(isalpha(test) != 0)]);
printf("%sascii\n",
ans[(__isascii(test) != 0)]);
printf("%sa control\n",
ans[(iscntrl(test) != 0)]);
printf("%sa letter,
underscore or digit\n",
ans[(__iscsym(test) != 0)]);
printf("%sa letter or underscore\n",
ans[(__iscsymf(test) != 0)]);
printf("%sa digit\n",
ans[(isdigit(test) != 0)]);
printf("%sprintable/ not a space\n",
ans[(isgraph(test) != 0)]);
printf("%slower case\n",
ans[(islower(test) != 0)]);
printf("%sprintable\n",
ans[(isprint(test) != 0)]);
printf("%sa punctuator\n",
ans[(ispunct(test) != 0)]);
printf("%swhite space\n",
ans[(isspace(test) != 0)]);
printf("%supper case\n",
ans[(isupper(test) != 0)]);
printf("%sa hexadecimal digit\n",
ans[(isxdigit(test) != 0)]);
printf("\n* press a key for the next
value*\n"); getch();
}
}
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