Write a program that requests the user to enter an alphabetic character. Then co

Question

Write a program that requests the user to enter an alphabetic character. Then convert the character from upper case to lower case or lower case to upper case. Print an error message if the user enters something other than an alphabetic character.

For example:

Enter an alphabetic character: A

Your input A converted to lower case is a.

Enter an alphabetic character: t

Your input t converted to upper case is T.

Enter a single digit or an alphabetic character: 9

You entered 9, which is not a letter.

Explanation / Answer

Here is the java code

import java.util.Scanner;
public class CheckCase
{

public static void main(String[] a)
{
char c;
String l;
  
Scanner sc= new Scanner(System.in);
System.out.println("Enter an alphabetic character: ");
l=sc.next();
  
c=l.charAt(0);
  
if(Character.isUpperCase(c))
System.out.println("Your input "+c+" converted to lower case is "+Character.toLowerCase(c));
else if(Character.isLowerCase(c))
System.out.println("Your input "+c+" converted to upper case is "+Character.toUpperCase(c));
else
System.out.println("You entered "+ c+", which is not a letter.");

}

}

// c++ code

#include <stdio.h>
#include <ctype.h>

main()
{
  
char c,e;   
   cout << "Enter an alphabetic character: ";
   cin >> c;
  
   if (isupper(c))
   {  
       e=tolower(c);
       cout << "Your input "<<c<<" converted to lower case is "<<e<<endl;
   }
   else if(islower(c))
   {
       e=toupper(c);
       cout<< "Your input "<<c<<" converted to upper case is "<<e<<endl;
   }
   else
   cout << "You entered "<< c<<", which is not a letter.";

}

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