Question

~IMPORTANT: you are NOT allowed to modify public static void main.~
Complete and fix program, by defining a countOccurrences function, and by modifying the existing mostFrequentCharacter function, so as to satisfy the following specs:

• Function countOccurrences takes two arguments, a string and a character. It returns the number of times the character occurs in the string.
• Function mostFrequentCharacter takes a string as an argument. It returns the character that occurs the most times in the string. If multiple characters tie for occurring the most times, the function can return any one of those characters tying for most occurrences.
• Upper-case letters should be treated as different from lower-case letters. Character 'A' is NOT the same as character 'a'.
• If there is a tie, and multiple characters appear the maximum amount of times, then the function can return any of those character that appear a maximum amount of times. Any of those return values will be considered correct.

IMPORTANT: you are NOT allowed to modify public static void main.

Initialize appropriately variables max_counter and max_char. For every letter in the string, count how many times it occurs in the string. If it occurs more times than max_counter, then update max_counter and max_char.

This is an example run of the complete program:

Enter some text, or q to quit: hello world
Most frequent character: 'l'
Number of occurrences of 'l': 3

Enter some text, or q to quit: 786768hjk jkh89'
Most frequent character: '8'
Number of occurrences of '8': 3

Enter some text, or q to quit: Q
Exiting...

import java.util.Scanner;

public class FrequentCharacter
{
  public static char mostFrequentCharacter(String text)
  {
    int max_counter = 0;
    char max_char = 'a'; // the initial value of max_char makes no difference.
    
    for (int i = 0; i < text.length(); i++)
    {
      char current = text.charAt(i);
      int counter = countOccurrences(text, current);

      // You need to complete the code for this function.

    }
    return max_char;
  }
  
 \*IMPORTANT: you are NOT allowed to modify public static void main.*\ 
  public static void main(String[] args) 
  {
    Scanner in = new Scanner(System.in);
    
    while (true)
    {
      System.out.printf("Enter some text, or q to quit: ");
      String text = in.nextLine();
      if (text.toLowerCase().equals("q"))
      {
        break;
      }
      if (text.length() == 0)
      {
        break;
      }
      
      char c = mostFrequentCharacter(text);
      int number = countOccurrences(text, c);
      System.out.printf("Most frequent character: '%c'\n", c);
      System.out.printf("Number of occurrences of '%c': %d\n\n", c, number);
    }
    System.out.printf("Exiting...\n");
  }
}

Answer 1

import java.util.Scanner;

public class FrequentCharacter {
   public static char mostFrequentCharacter(String text) {
       int max_counter = 0;
       char max_char = 'a'; // the initial value of max_char makes no
                               // difference.

       for (int i = 0; i < text.length(); i++) {
           char current = text.charAt(i);
           int counter = countOccurrences(text, current);
           // if current counter is greater than maxCounter
           // than make max as current counter
           if(counter>max_counter){
               max_char=current;
               max_counter=counter;
           }
           // You need to complete the code for this function.

       }
       return max_char;
   }

   // iterating the string and checking with given char
   // than increasing the counter
   private static int countOccurrences(String str, char c) {
       int count = 0;
       for (int i = 0; i < str.length(); i++)
           if (str.charAt(i) == c)
               count++;
       return count;
   }

   /* IMPORTANT: you are NOT allowed to modify public static void main. */
   public static void main(String[] args) {
       Scanner in = new Scanner(System.in);

       while (true) {
           System.out.printf("Enter some text, or q to quit: ");
           String text = in.nextLine();
           if (text.toLowerCase().equals("q")) {
               break;
           }
           if (text.length() == 0) {
               break;
           }

           char c = mostFrequentCharacter(text);
           int number = countOccurrences(text, c);
           System.out.printf("Most frequent character: '%c'\n", c);
           System.out.printf("Number of occurrences of '%c': %d\n\n", c, number);
       }
       System.out.printf("Exiting...\n");
   }
}

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