C Program to Display Characters from A to Z Using Loop | c programs for beginners

C Program to Display Characters from A to Z Using Loop

In this example, you will learn to print all the letters of the English alphabet.

To understand this example, you should have the knowledge of the following 

C programming topics:

·         C if...else Statement

·         C while and do...while Loop

Program to Print English Alphabets

#include < stdio >
int main() {
    char c;
    for (c = 'A'; c <= 'Z'; ++c)
        printf("%c ", c);
    return 0;
}

Output      

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

In this program, the for loop is used to display the English alphabet in uppercase.

Here's a little modification of the above program. The program displays the English alphabet in either uppercase or lowercase depending upon the input given by the user.

Print Lowercase/Uppercase alphabets

#include <stdio.h>
int main() {
    char c;
    printf("Enter u to display uppercase alphabets.\n");
    printf("Enter l to display lowercase alphabets. \n");
    scanf("%c", &c);

    if (c == 'U' || c == 'u') {
        for (c = 'A'; c <= 'Z'; ++c)
            printf("%c ", c);
    } else if (c == 'L' || c == 'l') {
        for (c = 'a'; c <= 'z'; ++c)
            printf("%c ", c);
    } else {
        printf("Error! You entered an invalid character.");
    }

    return 0;
}

Output

Enter u to display uppercase alphabets. 

Enter l to display lowercase alphabets. l

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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