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C++ Program to check Character is Alphabet or Not

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We will write a C++ program to check whether a character is an alphabet or not. Before that, you should have knowledge of the following in C++.

Program to Check Alphabet or Not in C++

First of all the program ask the user to enter a character that needed to be checked and then starts the process of checking.

Using if-else statement if checks whether entered character is greater than or equals to a and less than or equal to z or not. Along with that, using or operator (||) another condition is checked for the uppercase alphabet that is whether entered character is greater than or equals to A and less than or equal to Z or not.

If either of the condition is true then if the part is executed otherwise else part is executed. The program is checking for both lowercase alphabet and uppercase alphabet.

#include <iostream>
using namespace std;

int main()
{
   char ch;

   cout << "Enter a Character: ";
   cin >> ch;

   if ((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z'))
      cout << ch << " is an Alphabet";
   else
      cout << ch << " is NOT an Alphabet";

   return 0;
}

Output:

//Run 1
Enter a Character: A
A is an Alphabet

//Run 2
Enter a Character: 5
5 is NOT an Alphabet

Using ASCII Value

We will do the same except we will compare the character with ASCII value.

  • The ASCII values for lowercase characters ranges between 67 to 122. (‘a’ = 97 and ‘z’ = 122).
  • The ASCII values for uppercase characters ranges between 65 to 92. (‘A’ = 65 and ‘Z’ = 90).

C++ program to check whether the entered character is alphabet or not using ASCII value.

#include <iostream>
using namespace std;

int main()
{
   char ch;

   cout << "Enter a Character: ";
   cin >> ch;

   if ((ch >= 65 && ch <= 90) || (ch >= 97 && ch <= 122))
      cout << ch << " is an Alphabet";
   else
      cout << ch << " is NOT an Alphabet";

   return 0;
}

After executing this program, it will produce the same result as the first program mentioned above.

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