Question

Write a program to accept a character from the terminal window and determine whether it is a letter or not. if it is an alphabet, display its opposite case. if it is not an alphabet, display an appropriate message.

Answer 1

Program {JAVA} :

Import java.util.*;

public class Check

{Scanner sc= new Scanner( System.in);

   public void main()

   {

System.out.println(“Enter the characher”);

char ch= sc.next().chatAt(0);

       if(Character.isLetter(ch))

       {

           if(Character.isUpperCase(ch))

           System.out.println(ch+" opposite case is "+ Character.toLowerCase(ch));

           else

           System.out.println(ch+ " opposite case is " +Character.toUpperCase(ch));

           

       }

       else

       System.out.println(ch+" is not a letter");

   }

}

Answer 2

include <stdio.h>

int main()

{

   char ch;

   //Asking user to enter the character

   printf("Enter any character: ");

   //storing the entered character into the variable ch

   scanf("%c",&ch);

   if( (ch>='a' && ch<='z') || (ch>='A' && ch<='Z'))

       printf("The entered character %c is an Alphabet",ch);

   else

       printf("The entered character %c is not an Alphabet",ch);

   return 0;

}

Output 1:

Enter any character: 9

The entered character 9 is not an Alphabet

Output 2:

Enter any character: P

The entered character P is an Alphabet

You can also check the alphabet using the ASCII values of characters like this:

if((ch >= 97 && ch <= 122) || (ch >= 65 && ch <= 90))

  printf("The entered character %c is an Alphabet",ch);

else

  printf("The entered character %c is not an Alphabet",ch);

The ASCII value of ‘a’ is 97, ‘z’ is 122, ‘A’ is 65 and ‘Z’ is 90.