Question

Hallo!

I have a problem in my code, I need help please in java code.

My task is :

Write a program that can read a text from a file and do frequency analysis on the letters that occur . To store information (frequency) you must use an array.
Tip! The place where you collect the frequency of eg the letter A is the equivalent of the ASCII code of "A" ie 65.
The array should be 127 elements.
For more info see: asciitable.com  Output should be given in the form of a table:
Letter number
A 112
B 15
. ... ...
and so on
Frequency 9.33% 1.25%
The frequency is given in% and only letters that occur at least 1
once included.

my code is :

import java.util.Scanner;

import java.io.File;

import java.io.IOException;

import java.text.DecimalFormat;

public class FreqvensAnalys {

public static void main(String[] args) throws IOException {

int arr[] = new int[128];// array to store count of ascii char's

for (int i = 0; i < arr.length; i++)

arr[i] = 0;// initializes all values in arr to 0.

// opens file named input.txt and creates an object read.

Scanner read = new Scanner(new File("Klasslista(3).txt"));

String str = "";// reads the input data into str.

while (read.hasNextLine()) {

str += read.nextLine();

}

int i = 0, n = str.length();

while (i < n) {// iterates through the string and increases the count of

   // arr.

arr[(int) str.charAt(i)] += 1;

i++;

}

// prints the percentages and ascii values.

for (i = 0; i < arr.length; i++) {

double per = (arr[i] / (double) n) * 100;

System.out.printf("%3d : %2f ", i, per);}}}

/*=========================== END ================================*/

My problem in the out put, I get this out put! any body can help me please!

0 : NaN 1 : NaN 2 : NaN 3 : NaN 4 : NaN 5 : NaN 6 : NaN 7 : NaN 8 : NaN 9 : NaN 10 : NaN 11 : NaN 12 : NaN 13 : NaN 14 : NaN 15 : NaN 16 : NaN 17 : NaN 18 : NaN 19 : NaN 20 : NaN 21 : NaN 22 : NaN 23 : NaN 24 : NaN 25 : NaN 26 : NaN 27 : NaN 28 : NaN 29 : NaN 30 : NaN 31 : NaN 32 : NaN 33 : NaN 34 : NaN 35 : NaN 36 : NaN 37 : NaN 38 : NaN 39 : NaN 40 : NaN 41 : NaN 42 : NaN 43 : NaN 44 : NaN 45 : NaN 46 : NaN 47 : NaN 48 : NaN 49 : NaN 50 : NaN 51 : NaN 52 : NaN 53 : NaN 54 : NaN 55 : NaN 56 : NaN 57 : NaN 58 : NaN 59 : NaN 60 : NaN 61 : NaN 62 : NaN 63 : NaN 64 : NaN 65 : NaN 66 : NaN 67 : NaN 68 : NaN 69 : NaN 70 : NaN 71 : NaN 72 : NaN 73 : NaN 74 : NaN 75 : NaN 76 : NaN 77 : NaN 78 : NaN 79 : NaN 80 : NaN 81 : NaN 82 : NaN 83 : NaN 84 : NaN 85 : NaN 86 : NaN 87 : NaN 88 : NaN 89 : NaN 90 : NaN 91 : NaN 92 : NaN 93 : NaN 94 : NaN 95 : NaN 96 : NaN 97 : NaN 98 : NaN 99 : NaN 100 : NaN 101 : NaN 102 : NaN 103 : NaN 104 : NaN 105 : NaN 106 : NaN 107 : NaN 108 : NaN 109 : NaN 110 : NaN 111 : NaN 112 : NaN 113 : NaN 114 : NaN 115 : NaN 116 : NaN 117 : NaN 118 : NaN 119 : NaN 120 : NaN 121........................

Regardes!

Hi!

I have Eclipse, have to do anything for my environment?

What about file, Any file it's ok or not!

How I can put ASCII code as input file txt file,

Answer 1

import java.io.File;
import java.io.IOException;
import java.util.Scanner;

public class FreqvensAnalys {

public static void main(String[] args) throws IOException
{
int arr[] = new int[128];// array to store count of ascii char's
for (int i = 0; i < arr.length; i++)
{
arr[i] = 0;// initializes all values in arr to 0.
}
// opens file named input.txt and creates an object read.

Scanner read = new Scanner(new File("Klasslista(3).txt"));
String str = ""; // reads the input data into str.

while (read.hasNextLine())
{
str += read.nextLine();
}

int i = 0, n = str.length();
while (i < n) // iterates through the string and increases the count of arr
{
arr[(int) str.charAt(i)] += 1;
i++;
}
  
// prints the percentages and ascii values.
for (i = 0; i < arr.length; i++)
{
// prints a new line after every 10 lines
if(i % 10 == 0 && i != 0)
System.out.println();
double per = (arr[i] / (double) n) * 100;
System.out.printf("%3d : %.3f\t", i, per); // %.3f means decimal upto 3 places
}
System.out.println("\n");
}
}

****************************************************************** SCREENSHOT *********************************************************

Input File:

Console Output: