C program to print all printable characters

C program to print all printable characters:

A character is called printable character if it occupies a printing position. These characters includes all characters with ASCII value greater than 0x1f excluding 0x7f.

In C, we can check if a character is printable or not. There is a method called isprint, defined in ctype header, which we can use to verify if a character is printable.

In this post, we will learn how to print all printable characters in C.

isprint method:

isprint method is defined as like below:

int isprint(int c)

It takes one integer value as the argument. This is the ASCII value of a character that we need to pass. If we pass a character, it will convert that character to integer internally.

It returns one integer value. It returns one non-zero value, if it is a printable value. Else, it returns 0.

How to use isprint():

To use isprint, we need to import ctype.h header file. We can use it in a program after that.

Let me show you with an example:

#include <stdio.h>
#include <ctype.h>

int main()
{
    printf("Is printable 'c' : %d\n", isprint('c'));
    printf("Is printable '\t' : %d\n", isprint('\t'));

    return 0;
}

If you run this program, it will print the below output:

Is printable 'c' : 1
Is printable '  ' : 0

You can see that for ‘c’, it is printing ‘1’ and for tab, it is printing 0.

Print all printable characters using isprint() method:

We can also print all printable characters using isprint method. Using one loop, we can iterate through the ASCII numbers and if isprint returns non-zero value, we can print that character.

#include <stdio.h>
#include <ctype.h>

int main()
{
    int ch;

    for (ch = 1; ch <= 127; ch++)
    {
        if (isprint(ch) != 0)
            printf("%c ", ch);
    }

    return 0;
}

This program is printing all printable characters. If you run it, it will give the below output:

  ! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 7 8 9 : ; < = > ? @ A B C D E F G H I J K L M N O P Q R S T U V W X Y Z [ \ ] ^ _ ` a b c d e f g h i j k l m n o p q r s t u v w x y z { | } ~

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