Chapter 8, Problem 8.5E

(Character Testing) Write a program that inputs a character from the keyboard and tests it with each of the functions in the character-handling library. The program should print the value returned by each function.

Program Plan Intro

Program Plan: 

• mainfunction used to test all the functions.
• Declare character type of variable character.
• printf function used to print the formatted output on console.
• scanf function used to takea formatted inputfrom console.

Program Description: 

The following program will input character and test all the character-handling library functions.

Explanation of Solution

Program: 

//header file included
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
//included main function
intmain()
{
	//declare character type variable
char character;
//display message to user
printf("Enter the character:\n");
//input character
scanf("%c", &character);
//testing each function of character-handling library
//isdigit function
printf("'%c'%sdigit\n",character, isdigit(character)?"is a ":"is not a ");
//isalpha function
printf("'%c'%salphabet\n",character, isalpha(character)?"is a ":"is not a ");
//isalnum function
printf("'%c'%salpha-numeric\n",character, isalnum(character)?"is a ":"is not a ");
//isxdigit function
printf("'%c'%shexadecimal digit\n",character, isxdigit(character)?"is a ":"is not a ");
//islower function
printf("'%c'%slowercase letter\n",character, islower(character)?"is a ":"is not a ");
//isupper function
printf("'%c'%suppercase letter\n",character, isupper(character)?"is a ":"is not a ");
//toupper function
printf("The uppercase letter of '%c' is '%c'\n",character, toupper(character));
//tolower function
printf("The lowercase letter of '%c' is '%c'\n",character, tolower(character));
//isspace function
printf("'%c'%sspace\n",character, isspace(character)?"is a ":"is not a ");
//iscntrl function
printf("'%c'%scontrol character\n",character, iscntrl(character)?"is a ":"is not a ");
//ispunct function
printf("'%c'%sprinting character of ispunct\n",character, ispunct(character)?"is a ":"is not a ");
//isprint function
printf("'%c'%sprinting character of isprint\n",character, isprint(character)?"is a ":"is not a ");
//isgraph function
printf("'%c'%sprinting character of isgraph\n",character, isgraph(character)?"is a ":"is not a ");
//exiting from program
return 0;
}

Explanation:

In the above program, one character is inputted through scanf function. The %c is the format specifier used to input character type value. All the character-handling library function is used to test and print the output. The ternary operator is used inside the printf function to determine if the entered character is a digit, alphanumeric character, hexadecimal digit, lowercase letter or uppercase letter or not.

Sample Output: