Numbers to words in Java

Buffered Reader

Problem:

Write a program that accepts a number and output its equivalent in words.

Sample input/output:

Codes:

package javaapplication1;

import java.io.*;

public class num1 {

public static int charAt(int num, int index) {

return String.valueOf(num).charAt(index); }

private static PrintStream sys = System.out;

public static BufferedReader q = new BufferedReader (new InputStreamReader(System.in));

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

String[] units = {null, "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"};

String[] tenths = {"ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen",

"seventeen", "eighteen", "nineteen"};

String[] special = {null, null, "twenty", "thirty", "fourty", "fifty", "sixty", "seventy", "eighty", "ninety"};

String[] hundreds = {null, "one hundred", "two hundred", "three hundred", "four hundred", "five hundred",

"six hundred ", "seven hundred", "eight hundred", "nine hundred"};

String[] thousands = {null, "one thousand", "two thousand", "three thousand", "four thousand",

"five thousand","six thousand", "seven thousand", "eight thousand", "nine thousand"};

int y = 0, num = 0;

do {

sys.print("Enter a number: "); num = Integer.parseInt(q.readLine());

if (num < 10000)

y = 1;

} while (y==0);

int x = Integer.toString(num).length();

switch (x)

{

case 1: {

if (num == 0)

sys.println("zero");

else

sys.println(units[num]);

break; }

case 2: {

if (charAt(num,0) - '0' == 1)

sys.println(tenths[charAt(num,1) - '0']);

else

{

sys.print(special[charAt(num,0) - '0']+" ");

sys.println(units[charAt(num,1) - '0']);

}

break; }

case 3: {

sys.print(hundreds[charAt(num,0) - '0']+" ");

{

if (charAt(num,1) - '0' == 1)

sys.print(tenths[charAt(num, 2) - '0']);

else if (charAt(num,1) - '0' == 0)

{ if (charAt(num, 2) - '0' != 0)

sys.print(units[charAt(num, 2) - '0']); }

else

{

sys.print(special[charAt(num, 1) - '0'] + " ");

if (charAt(num,2) - '0' != 0)

sys.print(units[charAt(num,2) - '0']);

}

}

sys.println();

break; }

case 4: {

sys.print(thousands[charAt(num,0) - '0']+" ");

if (charAt(num,1) - '0' != 0)

sys.print(hundreds[charAt(num,1) - '0']+" ");

{

if (charAt(num,2) - '0' == 1)

sys.print(tenths[charAt(num, 3) - '0']);

else if (charAt(num,2) - '0' == 0)

{ if (charAt(num, 3) - '0' != 0)

sys.print(units[charAt(num, 3) - '0']); }

else

{

sys.print(special[charAt(num, 2) - '0'] + " ");

if (charAt(num,3) - '0' != 0)

sys.print(units[charAt(num,3) - '0']);

}

}

sys.println();

break; }

}

}

}