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Solved 2008 ICSE Computer Science Paper

Class 10 - ICSE Computer Science Solved Papers

Reverse Uppercase & Lowercase in String Program - ICSE 2008 Computer Science

Write a program to input a string and print out the text with the uppercase and lowercase letters reversed, but all other characters should remain the same as before.
Example:
INPUT: WelComE TO School
OUTPUT: wELcOMe to sCHOOL

Java 

import java.util.Scanner;
class Reverse{
    public static void main(String args[]){
        Scanner in = new Scanner(System.in);
        System.out.print("Enter the string: ");
        String s = in.nextLine();
        String t = "";
        for(int i = 0; i < s.length(); i++){
            char ch = s.charAt(i);
            if(Character.isUpperCase(ch))
                t += Character.toLowerCase(ch);
            else
                t += Character.toUpperCase(ch);
        }
        System.out.println(t);
    }
}

Output

 
 OUTPUT  : 
Enter the string: WelComE TO School
wELcOMe to sCHOOL
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