Write a program that prints a table of the binary, octal and hexadecimal equivalents of the decimal numbers in the range 1 through 256?

Answer 1

import java.util.Scanner;

public class NumberSystem

{

public void displayConversion()

{

Scanner input = new Scanner(System.in);

System.out.printf("%-20s%-20s%-20s%-20s\n", "Decimal",

"Binary", "Octal", "Hexadecimal");

for ( int i = 1; i <= 256; i++ )

{

String binary = Integer.toBinaryString(i);

String octal = Integer.toOctalString(i);

String hexadecimal = Integer.toHexString(i);

System.out.format("%-20d%-20s%-20s%-20s\n", i,

binary, octal, hexadecimal);

}

}

// returns a string representation of the decimal number in binary

public String toBinaryString( int dec )

{

String binary = " ";

while (dec >= 1 )

{

int value = dec % 2;

binary = value + binary;

dec /= 2;

}

return binary;

}

//returns a string representation of the number in octal

public String toOctalString( int dec )

{

String octal = " ";

while ( dec >= 1 )

{

int value = dec % 8;

octal = value + octal;

dec /= 8;

}

return octal;

}

public String toHexString( int dec )

{

String hexadecimal = " ";

while ( dec >= 1 )

{

int value = dec % 16;

switch (value)

{

case 10:

hexadecimal = "A" + hexadecimal;

break;

case 11:

hexadecimal = "B" + hexadecimal;

break;

case 12:

hexadecimal = "C" + hexadecimal;

break;

case 13:

hexadecimal = "D" + hexadecimal;

break;

case 14:

hexadecimal = "E" + hexadecimal;

break;

case 15:

hexadecimal = "F" + hexadecimal;

break;

default:

hexadecimal = value + hexadecimal;

break;

}

dec /= 16;

}

return hexadecimal;

}

public static void main( String args[])

{

NumberSystem apps = new NumberSystem();

apps.displayConversion();

}

}