Check whether the given character is in upper case, lower case or non alphabetic character

Given a character, the task is to check whether the given character is in upper case, lower case, or non-alphabetic character 

Examples:

Input: ch = 'A'
Output: A is an UpperCase character

Input: ch = 'a'
Output: a is an LowerCase character

Input: ch = '0'
Output: 0 is not an alphabetic character

Approach: The key to solving this problem lies in the ASCII value of a character. It is the simplest way to find out about a character. This problem is solved with the help of the following detail: 

• Capital letter Alphabets (A-Z) lie in the range 65-91 of the ASCII value
• Small letter Alphabets (a-z) lie in the range 97-122 of the ASCII value
• Any other ASCII value is a non-alphabetic character.

Implementation:

C++

// C++ implementation of the above approach
#include <bits/stdc++.h>
using namespace std;

void check(char ch)
{

    if (ch >= 'A' && ch <= 'Z')
        cout << ch << " is an UpperCase character\n";

    else if (ch >= 'a' && ch <= 'z')
        cout << ch << " is an LowerCase character\n";

    else
        cout << ch << " is not an alphabetic character\n";
}

// Driver Code
int main()
{
    char ch;

    // Get the character
    ch = 'A';

    // Check the character
    check(ch);

    // Get the character
    ch = 'a';

    // Check the character
    check(ch);

    // Get the character
    ch = '0';

    // Check the character
    check(ch);

    return 0;
}

// This code is contributed by Code_Mech

C

// C implementation of the above approach
#include <stdio.h>

void check(char ch)
{

    if (ch >= 'A' && ch <= 'Z')
        printf("\n%c is an UpperCase character",
               ch);

    else if (ch >= 'a' && ch <= 'z')
        printf("\n%c is an LowerCase character",
               ch);

    else
        printf("\n%c is not an alphabetic character",
               ch);
}

// Driver Code
int main()
{
    char ch;

    // Get the character
    ch = 'A';

    // Check the character
    check(ch);

    // Get the character
    ch = 'a';

    // Check the character
    check(ch);

    // Get the character
    ch = '0';

    // Check the character
    check(ch);

    return 0;
}

Java

// Java implementation of the above approach

class GFG
{

    static void check(char ch)
    {

        if (ch >= 'A' && ch <= 'Z')
            System.out.println("\n" + ch +
                    " is an UpperCase character");

        else if (ch >= 'a' && ch <= 'z')
            System.out.println("\n" + ch +
                    " is an LowerCase character" );

        else
            System.out.println("\n" + ch +
                    " is not an alphabetic character" );
    }

    // Driver Code
    public static void main(String []args)
    {
        char ch;

        // Get the character
        ch = 'A';

        // Check the character
        check(ch);

        // Get the character
        ch = 'a';

        // Check the character
        check(ch);

        // Get the character
        ch = '0';

        // Check the character
        check(ch);

    }
}

// This code is contributed by Ryuga

Python3

# Python3 implementation of the above approach

def check(ch):

    if (ch >= 'A' and ch <= 'Z'):
        print(ch,"is an UpperCase character");

    elif (ch >= 'a' and ch <= 'z'):
        print(ch,"is an LowerCase character");
    else:
        print(ch,"is not an alphabetic character");

# Driver Code

# Get the character
ch = 'A';

# Check the character
check(ch);

# Get the character
ch = 'a';

# Check the character
check(ch);

# Get the character
ch = '0';

# Check the character
check(ch);

# This code is contributed by mits

C#

// C# implementation of the above approach
using System;

class GFG
{

    static void check(char ch)
    {
        if (ch >= 'A' && ch <= 'Z')
            Console.WriteLine("\n" + ch +
                    " is an UpperCase character");
        else if (ch >= 'a' && ch <= 'z')
            Console.WriteLine("\n" + ch +
                    " is an LowerCase character" );
        else
            Console.WriteLine("\n" + ch +
                    " is not an alphabetic character" );
    }

    // Driver Code
    public static void Main(String []args)
    {
        char ch;

        // Get the character
        ch = 'A';

        // Check the character
        check(ch);

        // Get the character
        ch = 'a';

        // Check the character
        check(ch);

        // Get the character
        ch = '0';

        // Check the character
        check(ch);
    }
}

// This code is contributed by Rajput-JI

PHP

<?php
// PHP implementation of the above approach

function check($ch)
{
    if ($ch >= 'A' && $ch <= 'Z')
        print($ch . " is an UpperCase character\n");

    else if ($ch >= 'a' && $ch <= 'z')
        print($ch . " is an LowerCase character\n");
    else
        print($ch . " is not an alphabetic " .
                               "character\n");
}

// Driver Code

// Get the character
$ch = 'A';

// Check the character
check($ch);

// Get the character
$ch = 'a';

// Check the character
check($ch);

// Get the character
$ch = '0';

// Check the character
check($ch);

// This code is contributed by mits
?>

Javascript

<script>
      // JavaScript implementation of
      // the above approach

      function check(ch) {
        if (ch >= "A" && ch <= "Z")
          document.write(ch +
          " is an UpperCase character <br>");
        else if (ch >= "a" && ch <= "z")
          document.write(ch +
          " is an LowerCase character <br>");
        else document.write(ch +
        " is not an alphabetic character <br>");
      }

      // Driver Code

      var ch;
      // Get the character
      ch = "A";

      // Check the character
      check(ch);

      // Get the character
      ch = "a";

      // Check the character
      check(ch);

      // Get the character
      ch = "0";

      // Check the character
      check(ch);

</script>

Output

A is an UpperCase character
a is an LowerCase character
0 is not an alphabetic character

Time Complexity: O(1) as it is doing constant operations
Auxiliary Space: O(1)

Check whether the given character is in upper case, lower case, or non-alphabetic character using the inbuilt library: 

C++

// C++ code to check if a char is uppercase,
// lowercase or not an alphabetic character
#include <bits/stdc++.h>
using namespace std;

void check(char ch)
{
    if (isupper(ch))
        cout << ch << " is an upperCase character\n";

    else if (islower(ch))
        cout << ch << " is a lowerCase character\n";

    else
        cout << ch << " is not an alphabetic character\n";
}

// Driver Code
int main()
{
    char ch;
    ch = 'A';

    // Check the character
    check(ch);

    // Get the character
    ch = 'a';

    // Check the character
    check(ch);

    // Get the character
    ch = '0';

    // Check the character
    check(ch);

    return 0;
    // This code is contributed by Shivesh Kumar Dwivedi
}

Java

import java.util.*;

class Main {

    public static void check(char ch)
    {
        if (Character.isUpperCase(ch))
            System.out.println(
                ch + " is an upperCase character");
        else if (Character.isLowerCase(ch))
            System.out.println(
                ch + " is a lowerCase character");
        else
            System.out.println(
                ch + " is not an alphabetic character");
    }

    public static void main(String[] args)
    {
        char ch;
        ch = 'A';

        // Check the character
        check(ch);

        // Get the character
        ch = 'a';

        // Check the character
        check(ch);

        // Get the character
        ch = '0';

        // Check the character
        check(ch);
    }
}

Python3

def check(ch):
    if ch.isupper():
        print(ch, "is an upperCase character")
    elif ch.islower():
        print(ch, "is a lowerCase character")
    else:
        print(ch, "is not an alphabetic character")

# Driver Code
if __name__ == '__main__':
    ch = 'A'

    # Check the character
    check(ch)

    # Get the character
    ch = 'a'

    # Check the character
    check(ch)

    # Get the character
    ch = '0'

    # Check the character
    check(ch)

C#

using System;

class Program
{
    static void check(char ch)
    {
        if (Char.IsUpper(ch))
            Console.WriteLine("{0} is an upperCase character", ch);

        else if (Char.IsLower(ch))
            Console.WriteLine("{0} is a lowerCase character", ch);

        else
            Console.WriteLine("{0} is not an alphabetic character", ch);
    }

    static void Main(string[] args)
    {
        char ch;
        ch = 'A';

        // Check the character
        check(ch);

        // Get the character
        ch = 'a';

        // Check the character
        check(ch);

        // Get the character
        ch = '0';

        // Check the character
        check(ch);

        // Pause the console
        Console.ReadLine();
    }
}

Javascript

function check(ch) {
  if (ch.match(/[A-Z]/)) {
    console.log(ch + " is an upperCase character");
  } else if (ch.match(/[a-z]/)) {
    console.log(ch + " is a lowerCase character");
  } else {
    console.log(ch + " is not an alphabetic character");
  }
}

// Driver Code
let ch;
ch = 'A';

// Check the character
check(ch);

// Get the character
ch = 'a';

// Check the character
check(ch);

// Get the character
ch = '0';

// Check the character
check(ch);

Output

A is an UpperCase character
a is an LowerCase character
0 is not an alphabetic character

Time Complexity: O(1)
Auxiliary Space: O(1)

Approach :

This implementation uses a switch statement to check the value of the character. If it is an uppercase letter, it will print that it is an uppercase letter. If it is a lowercase letter, it will print that it is a lowercase letter. Otherwise, it will print that it is not an alphabetic character.

C++

#include <iostream>
using namespace std;

void check(char ch)
{
    switch(ch)
    {
        case 'A':
        case 'B':
        case 'C':
        case 'D':
        case 'E':
        case 'F':
        case 'G':
        case 'H':
        case 'I':
        case 'J':
        case 'K':
        case 'L':
        case 'M':
        case 'N':
        case 'O':
        case 'P':
        case 'Q':
        case 'R':
        case 'S':
        case 'T':
        case 'U':
        case 'V':
        case 'W':
        case 'X':
        case 'Y':
        case 'Z':
            cout << ch << " is an UpperCase character\n";
            break;

        case 'a':
        case 'b':
        case 'c':
        case 'd':
        case 'e':
        case 'f':
        case 'g':
        case 'h':
        case 'i':
        case 'j':
        case 'k':
        case 'l':
        case 'm':
        case 'n':
        case 'o':
        case 'p':
        case 'q':
        case 'r':
        case 's':
        case 't':
        case 'u':
        case 'v':
        case 'w':
        case 'x':
        case 'y':
        case 'z':
            cout << ch << " is a LowerCase character\n";
            break;

        default:
            cout << ch << " is not an alphabetic character\n";
            break;
    }
}

int main()
{
    char ch;

    ch = 'A';
    check(ch);

    ch = 'a';
    check(ch);

    ch = '0';
    check(ch);

    return 0;
}

Output

A is an UpperCase character
a is a LowerCase character
0 is not an alphabetic character

Time Complexity: O(1)
Auxiliary Space: O(1)