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import java.util.Scanner;
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public class Activity_5_ITC_101 {
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    public static void main(String[] args) {
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        Scanner sc = new Scanner(System.in);
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        while (true) {
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        mainFrame(sc);
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        }
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    }
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    public static void mainFrame (Scanner sc) {
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        System.out.println("\tACTIVITY 5 ITC 101\n");
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        System.out.println("1. String length and character Extraction");
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        System.out.println("2. Convert and Combine Strings");
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        System.out.println("3. Extract Substring");
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        System.out.println("4. Revrse String");
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        System.out.println("5. Find and count a Character");
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        int selection = sc.nextInt();
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        sc.nextLine();
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        selection(selection,sc);
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    }
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    public static void selection (int selection, Scanner sc) {
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        switch (selection) {
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            case 1:
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                act1(sc);
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                break;
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             case 2:
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                 act2(sc);
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                break;
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            case 3:
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                act3(sc);
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                break;
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            case 4:
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                act4(sc);
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                break;
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            case 5:
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                act5(sc);
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                break;
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            default:
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                System.out.println("You Entered an invalid Selection");
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                   break;
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        }
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    }
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    public static void act1 (Scanner sc) {
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        System.out.print("Enter Word: ");
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        String word = sc.nextLine();
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        System.out.println("Length of Word: " + wordlenght(word));
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        System.out.println("First Letter: " + word.charAt(0));
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        System.out.println("Last Letter: " + word.charAt(word.length() -1));
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    }
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    public static int wordlenght (String word) {
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        int wordnum = word.length();
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        return wordnum;
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    }
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    public static void act2 (Scanner sc) {
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        System.out.print("Enter the First Word: ");
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        String word1 = sc.nextLine();
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        System.out.print("Enter Second Word: ");
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        String word2  = sc.nextLine();
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        System.out.println(convertCombine(word1, word2));
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    }
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    public static String convertCombine (String word1 , String word2) {
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        word1 = word1.toUpperCase();
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        word2 = word2.toLowerCase();
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        String combined = word1.concat(word2);
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        return "Combined String is: "+ combined;
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    }
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   public static void act3 (Scanner sc) {
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       System.out.println("Enter a Sentence: ");
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       String word = sc.nextLine();
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       System.out.println(extracting(word));
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   }
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   public static String extracting (String word) {
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       if(word.length() < 5) {
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           return "First 5 Characters: " + word;
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       } else {
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           return word.substring(0,5);
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       }
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   }
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   public static void act4 (Scanner sc) {
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       System.out.print("Enter a Word: " );
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       String word = sc.nextLine();
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       System.out.println("Reversed: " + reverse(word));
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   }
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   public static String reverse (String word) {
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       String newWord= "";
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       char ch;
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      for(int i = word.length() -1; i >= 0; i--) {
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          ch = word.charAt(i);
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          newWord += ch;
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      }
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      return newWord;
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   }
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   public static void act5 (Scanner sc) {
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       System.out.print("Enter a Sentence: ");
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       String word  = sc.nextLine();
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       System.out.print("Enter Character: ");
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       char ch = sc.next().charAt(0);
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       System.out.println("The Character " + ch + " Appears " + numberOfchar(word, ch) + " Times in the Sentence");
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   }
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   public static int numberOfchar (String word, char ch) {
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       int count = 0;
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       for(int i = 0 ; i < word.length(); i++) {
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           if(ch == word.charAt(i)) {
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               count++;
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           }
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       }
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       return count;
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   }
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}