Check a char: is it a control letter : Char Validation « Data Type « C / ANSI-C

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C / ANSI-C » Data Type » Char ValidationScreenshots 
Check a char: is it a control letter

#include <ctype.h>
#include <stdio.h>

int main(void)
{
  char ch;

  for(;;) {
    ch = getchar();
    if(ch=='.'
        break;
    if(iscntrl(ch))
      printf("%c is a control character\n", ch);
  }

  return 0;
}
           
       
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4.Is char a control char
5.Is it a digit
6.Is it printable: isgraph
7.Is it a lowercase char
8.Is it printable
9.Is a char punctuation
10.Is it a space char
11.Is it a uppercase char
12.is it a hexadecimal digit
13.Check a char: is it a letter
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