Print number of words, vowels and frequency of each character

Given a string str with uppercase, lowercase and special characters. The input string is to end with either a space or a dot. The problem is to calculate the number of words, vowels and frequency of each character of the string in a separate line.

Example :

Input : How Good GOD Is.

Output : 
Number of words = 4
Number of vowels = 5
Number of upper case characters = 6
Character =   Frequency = 3
Character = . Frequency = 1
Character = D Frequency = 1
Character = G Frequency = 2
Character = H Frequency = 1
Character = I Frequency = 1
Character = O Frequency = 1
Character = d Frequency = 1
Character = o Frequency = 3
Character = s Frequency = 1
Character = w Frequency = 1

Approach : We use a TreeMap to store characters and their frequencies. TreeMap is used to get the output in sorted order.



Below is Java implementation of above approach :

C++

filter_none

edit
close

play_arrow

link
brightness_4
code

// C++ program to print Number of Words,
// Vowels and Frequency of Each Character
#include <bits/stdc++.h>
using namespace std;
  
void words(string str)
{
    int wcount = 0, ucount = 0, vcount = 0;
    for (int i = 0; i < str.length(); i++) 
    {
        char c = str[i];
        switch (c) 
        {
            case ' ':
            case '.':
            wcount++; // more delimiters can be given
        }
  
        switch (c) 
        {
            case 'A':
            case 'E':
            case 'I':
            case 'O':
            case 'U':
            case 'a':
            case 'e':
            case 'i':
            case 'o':
            case 'u':
                vcount++;
        }
  
        if (c >= 65 and c <= 90) ucount++;
    }
  
    cout << "Number of words = " 
         << wcount << endl;
    cout << "Number of vowels = " 
         << vcount << endl;
    cout << "Number of upper case characters = " 
         << ucount << endl;
}
  
// Function to calculate the frequency
// of each character in the string
void frequency(string str) 
{
    // Creates an empty TreeMap
    map<char, int> hmap;
  
    // Traverse through the given array
    for (int i = 0; i < str.length(); i++) 
        hmap[str[i]]++;
  
    // Print result
    for (auto i : hmap)
    {
        cout << "Character = " << i.first;
        cout << " Frequency = " 
             << i.second << endl;
    }
}
  
// Driver Code
int main(int argc, char const *argv[])
{
    string str = "Geeks for Geeks.";
    words(str);
    frequency(str);
    return 0;
}
  
// This code is contributed by
// sanjeev2552

chevron_right


Java

filter_none

edit
close

play_arrow

link
brightness_4
code

// Java program to print Number of Words,
// Vowels and Frequency of Each Character
import java.util.*;
import java.lang.*;
import java.io.*;
  
public class Stringfun 
{
    String str = "Geeks for Geeks.";
  
    void words()
    {
        int wCount = 0, uCount = 0, vCount = 0;
  
        for (int i = 0; i < str.length(); i++) 
        {
            char c = str.charAt(i);
  
            switch (c) 
            {
            case ' ':
            case '.':
                wCount++; // more delimiters can be given
            }
  
            switch (c) 
            {
            // program for calculating number of vowels
            case 'A':
            case 'E':
            case 'I':
            case 'O':
            case 'U':
            case 'a':
            case 'e':
            case 'i':
            case 'o':
            case 'u':
                vCount++;
            }
  
            if (c >= 65 && c <= 90
            {
                uCount++;
            }
        }
  
        System.out.println("Number of words = " + wCount);
        System.out.println("Number of vowels = " + vCount);
        System.out.println("Number of upper case characters = "
                                                        + uCount);
    }
  
    // Function to calculate the frequency
    // of each character in the string
    void frequency()
    {
        // Creates an empty TreeMap
        TreeMap<Character, Integer> hmap = 
                     new TreeMap<Character, Integer>();
   
        // Traverse through the given array
        for (int i = 0; i < str.length(); i++)
        {
            Integer c = hmap.get(str.charAt(i));
   
            // If this is first occurrence of element 
            if (hmap.get(str.charAt(i)) == null)
               hmap.put(str.charAt(i), 1);
   
            // If elements already exists in hash map
            else
              hmap.put(str.charAt(i), ++c);
        }
          
        // Print result
        for (Map.Entry m:hmap.entrySet())
          System.out.println("Character = " + m.getKey() + 
                         " Frequency = " + m.getValue());
    }
  
    // Driver program to run and test above program
    public static void main(String args[]) throws IOException
    {
        Stringfun obj = new Stringfun();
        obj.words();
        obj.frequency();
    }
}

chevron_right



Output :

Number of words = 3
Number of vowels = 5
Number of upper case characters = 2
Character =   Frequency = 2
Character = . Frequency = 1
Character = G Frequency = 2
Character = e Frequency = 4
Character = f Frequency = 1
Character = k Frequency = 2
Character = o Frequency = 1
Character = r Frequency = 1
Character = s Frequency = 2

Time Complexity : O(n), where n is the number of characters in the string.
Auxiliary Space : O(1).



My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.



Improved By : sanjeev2552