Question

C++ Linux Compiler

Letter Frequency Write a function that will take a string and return a count of each letter in the string. For example, "my dog ate my homework" contains 3 m's, 3 o's, 2 e's, 2 y's and one each of d, g, a, t, h, w, r and k. Your function should take a single string argument and return a dynamically allocated array of 26 integers representing the count of each of the letters a .. z respectively. Your function should be case insensitive, i.e., count 'A' and 'a' as the occurrence of the letter a. Do not count non-letter characters (i.e., spaces, punctuation, digits, etc.) Write a program that will solicit a string from the user using getline, call your letter frequency function and print out the frequency of each letter in the string. Do not list letters that do not occur at least once. Example: Enter a string: my dog at my homework Letter frequency a 1 d 1 e 1 g 1 h 1 k 1 m 3 o 3 r 1 t 1 w 1 y 2

Answer 1

• Source Code:

​import java.io.*;

class Frequency
{
static String n;
static int l;
 public static void main(String args[]) throws IOException
 {
 BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
 System.out.print("Enter a String : ");
 n = br.readLine();
 l = n.length();
 freq();
 }
 public static void freq()
 {
 int s=0,f=-1;
 for(int i=0;i<l;i++)
 {
  // Find frequecy
  for(int j=0;j<l;j++)
  {
   if(n.charAt(i)==n.charAt(j))
   s++;
  }

  // Check if the letter has occured before
  for(int k=0;k<i;k++)
  {
   if(n.charAt(i)==n.charAt(k))
   f = 1;
  }

  // Print the letter's frequency
  if(f==-1)
   System.out.println(n.charAt(i) +" = " +s);
  s=0;
  f=-1;
 }
 }
}

• Output:
• Enter a String : reverberate
  r = 3
  e = 4
  v = 1
  b = 1
  a = 1
  t = 1
• Preview:
• 
  File Edit Search View Encoding Language Settings Macro Run Plugins Window? mport Java.io. 2 class Frequency (static String n 4static int 1: public static void main (String arg) throws IOException BufferedReader br-ew BufferedRcader (ner InputStreamRecader (System.in)) System.our print ("Enter a String) n - br.readLine O 1 = n. length () ; frea) 10 12 13 public static void frea) { int 9-0, f=-1 ; for (int i-0:i<l:itt) 15 16 17 18 19 20 21 // Find frequecy for (int j=DJ<1 ; j++) if (n.charAt (i)-.charAt (j)) // Check if the letter has occured before for (int k-Dk<i k++) 23 24 25 26 27 28 29 30 31 32 í f (n . charat ( i ) f-1 n. charAt ( k) ) // Print the letter' frequency System.out.println (n.charAt (i) f--1 Jave source file length: 704 lines: 3:3 Ln:1 Col:1 Sel:0 DoslWindows ANS INS 08:36 ▲ l"e @ ..1149 17-04-2017
  
• Output:
• 
  erEenith Desktopjavac Frequency.java CNUserrsEenith Desktop>java Frequency nter a StringWelconcThis is java progranning Users Zenith Desktop>java Frequency Ln: 16 Col:2 Sel:0 DoslWindows ANS INS 08:35 17-04-2017