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CoursesCSC122โปรแกรมสลับตัวอักษรไปกลับ

โปรแกรมสลับตัวอักษรไปกลับ

โจทย์

Write a program to encrypt the given sentence with following steps:

  • Convert a sentence to uppercase.
  • Swap a character with its swap pair.
  • Reverse a sentence and print.

The input consists of 3 parts:

  • A sentence
  • Number of swap pair
  • Swap pair

Here are steps of encryption:

  • Convert a sentence to uppercase -> HELLO JAVA
  • Swap a character with its swap pair. -> HTLLO JRVR
  • Reverse a sentence and print. -> RVRJ OLLTH
InputOutput
Hello Java
2
E T
A R		RVRJ OLLTH

โค้ด

import java.util.*;
 
public class Program {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
 
        String sentence = scanner.nextLine().toUpperCase();
 
        int pairs = scanner.nextInt();
        Map<Character, Character> map = new HashMap<>();
        for (int i = 0; i < pairs; i++) {
            char key = scanner.next().toUpperCase().charAt(0);
            char value = scanner.next().toUpperCase().charAt(0);
 
            map.put(key, value);
            map.put(value, key);
        }
 
        StringBuilder sentenceBuilder = new StringBuilder();
        for (char c : sentence.toCharArray()) {
            if (map.containsKey(c)) {
                sentenceBuilder.append(map.get(c));
            } else {
                sentenceBuilder.append(c);
            }
        }
 
        System.out.println(sentenceBuilder.reverse().toString());
    }
}

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