C Program to Display Letters from A to Z

C programs to display uppercase letters from A to Z or lowercase letters from a to z have been shown here. Both the iterative and recursive approaches have been covered.

Page content(s):

1. Program & Output

 1.1. Iterative approach

 1.2. Recursive approach

1. C program & output to Display Characters from A to Z

1.1. C program & output to Display Characters from A to Z using Iteration

Code has been copied

/*************************************
	   alphabetacoder.com
C Program to display characters 
from A to Z or a to z using iteration
**************************************/

#include <stdio.h>

int main() {
    // declare variables
    int i, s;

    // take input of the number
    printf("Enter 1 to display A to Z\n");
    printf("Enter 2 to display a to z\n");
    printf("Your choice >> ");
    scanf("%d", & s);

    // display result
    if (s == 1) {
        // display uppercase letters
        for (i = 'A'; i <= 'Z'; i++) {
            printf("%c ", (char) i);
        }
    } else if (s == 2) {
        // display lowercase letters
        for (i = 'a'; i <= 'z'; i++) {
            printf("%c ", (char) i);
        }
    } else
        printf("Wrong choice!\n");;

    return 0;
}

Output

Case 1:

Enter 1 to display A to Z

Enter 2 to display a to z

Your choice >> 1

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

Case 2:

Enter 1 to display A to Z

Enter 2 to display a to z

Your choice >> 2

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

Case 3:

Enter 1 to display A to Z

Enter 2 to display a to z

Your choice >> 3

Wrong choice!

1.2. C program & output to Display Characters from A to Z using Recursion

Code has been copied

/*************************************
           alphabetacoder.com
C Program to display characters 
from A to Z or a to z using recursion
**************************************/

#include <stdio.h>

// recursive function to print A to Z
void print_uppercase(char i, char j) {
    // display current character
    printf("%c ", i);

    // exit condition
    if (i == j)
        return;
    // call function
    print_uppercase(++i, j);
}

// recursive function to print a to z
void print_lowercase(char i, char j) {
    // display current character
    printf("%c ", i);

    // exit condition
    if (i == j)
        return;
    // call function
    print_lowercase(++i, j);
}

int main() {
    // declare variables
    int i, s;

    // take input of the number
    printf("Enter 1 to display A to Z\n");
    printf("Enter 2 to display a to z\n");
    printf("Your choice >> ");
    scanf("%d", & s);

    // display result
    if (s == 1) {
        // display uppercase letters
        // by calling recursive function
        print_uppercase('A', 'Z');

    } else if (s == 2) {
        // display lowercase letters
        // by calling recursive function
        print_lowercase('a', 'z');
    } else
        printf("Wrong choice!\n");;

    return 0;
}

Output

Case 1:

Enter 1 to display A to Z

Enter 2 to display a to z

Your choice >> 1

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

Case 2:

Enter 1 to display A to Z

Enter 2 to display a to z

Your choice >> 2

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

Case 3:

Enter 1 to display A to Z

Enter 2 to display a to z

Your choice >> 0

Wrong choice!