Using functions isdigit, isalpha, isalnum, and isxdigit : char function « Data Type « C Tutorial

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C Tutorial » Data Type » char function 
2.15.2.Using functions isdigit, isalpha, isalnum, and isxdigit
#include <stdio.h>
#include <ctype.h>
 
int main()

   printf"%s\n%s%s\n%s%s\n\n""According to isdigit: ",
       isdigit'8' "8 is a " "8 is not a ""digit",
       isdigit'#' "# is a " "# is not a ""digit" );

   printf"%s\n%s%s\n%s%s\n%s%s\n%s%s\n\n"
       "According to isalpha:",
       isalpha'A' "A is a " "A is not a ""letter",
       isalpha'b' "b is a " "b is not a ""letter",
       isalpha'&' "& is a " "& is not a ""letter",
       isalpha'4' "4 is a " "4 is not a ""letter" );

   printf"%s\n%s%s\n%s%s\n%s%s\n\n"
       "According to isalnum:",
       isalnum'A' "A is a " "A is not a "
       "digit or a letter",
       isalnum'8' "8 is a " "8 is not a "
       "digit or a letter",
       isalnum'#' "# is a " "# is not a "
       "digit or a letter" );

   printf"%s\n%s%s\n%s%s\n%s%s\n%s%s\n%s%s\n"
       "According to isxdigit:",
       isxdigit'F' "F is a " "F is not a "
       "hexadecimal digit",
       isxdigit'J' "J is a " "J is not a "
       "hexadecimal digit",
       isxdigit'7' "7 is a " "7 is not a "
       "hexadecimal digit",
       isxdigit'$' "$ is a " "$ is not a "
       "hexadecimal digit",
       isxdigit'f' "f is a " "f is not a "
       "hexadecimal digit" );

   return 0;

}
According to isdigit:
8 is a digit
# is not a digit

According to isalpha:
A is a letter
b is a letter
& is not a letter
4 is not a letter

According to isalnum:
A is a digit or a letter
8 is a digit or a letter
# is not a digit or a letter

According to isxdigit:
F is a hexadecimal digit
J is not a hexadecimal digit
7 is a hexadecimal digit
$ is not a hexadecimal digit
f is a hexadecimal digit
2.15.char function
2.15.1.Using functions islower, isupper, tolower, toupper
2.15.2.Using functions isdigit, isalpha, isalnum, and isxdigit
2.15.3.Using functions isspace, iscntrl, ispunct, isprint, isgraph
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