Question

In java Write a program that asks the user to choose a selection (Enter 1 to convert from binary to decimal, 2 to convert from decimal to binary, 3 to convert binary to hexadecimal, 4 to convert hexadecimal to binary, 5 to convert decimal to hexadecimal, 6 to convert hexadecimal to decimal. Pls do it by creating classes and objects with get and set method.

Answer 1

Code To Copy:

import java.util.Scanner;
import java.io.*;

public class HelloWorld{

public static void main(String []args){
System.out.println("Enter 1 to convert from binary to decimal");
System.out.println("Enter 2 to convert from decimal to binary");
System.out.println("Enter 3 to convert from binary to hexadecimal");
System.out.println("Enter 4 to convert from hexadecimal to binary");
System.out.println("Enter 5 to convert from decimal to hexadecimal");
System.out.println("Enter 6 to convert from hexadecimal to decimal");
  
Scanner myObj = new Scanner(System.in);
int choice = myObj.nextInt();
  
Conversions obj = new Conversions();
  
if(choice==1){
System.out.println("Enter the Binary number to be converted : ");
int n = myObj.nextInt();

System.out.print("\nEquivalent Decimal value is : ");
obj.binaryToDecimal(n);
}
else if(choice==2){
System.out.println("Enter the Decimal number to be converted : ");
int n = myObj.nextInt();

System.out.print("\nEquivalent Binary value is : ");
obj.decToBinary(n);
}
else if(choice==3){
System.out.println("Enter the Binary number to be converted : ");
int n = myObj.nextInt();
int dec = obj.binaryToDecimal(n);

  System.out.print("\nEquivalent Hexadecimal value is : ");
obj.decToHexa(dec);
}
else if(choice==4){
System.out.println("Enter the Hexadecimal number to be converted : ");
String s = myObj.next();
char hexdec[] = new char[100] ;
hexdec = s.toCharArray() ;
System.out.print("\nEquivalent Binary value is : ");
try{
obj.HexToBin(hexdec);
}
catch (ArrayIndexOutOfBoundsException e){
System.out.print("");
}
}
else if(choice==5){
System.out.println("Enter the decimal number to be converted : ");
int n = myObj.nextInt();

System.out.print("\nEquivalent Hexadecimal value is : ");
obj.decToHexa(n);
}
else if(choice==6){
System.out.println("Enter the Hexadecimal number to be converted : ");
String n = myObj.next();

System.out.print("\nEquivalent Decimal value is : ");
obj.hexaToDec(n);
}
else{
System.out.println("Invalid Choice ...");
}
  
  
}
}

class Conversions{
int binaryToDecimal(int n)
{
int num = n;
int dec_value = 0;
int base = 1;
  
int temp = num;
while (temp > 0) {
int last_digit = temp % 10;
temp = temp / 10;
  
dec_value += last_digit * base;
  
base = base * 2;
}
  
return dec_value;
}
  
void decToBinary(int n)
{
int[] binaryNum = new int[1000];
int i = 0;
while (n > 0)
{
binaryNum[i] = n % 2;
n = n / 2;
i++;
}

for (int j = i - 1; j >= 0; j--)
System.out.print(binaryNum[j]);
}
  
void HexToBin(char hexdec[])
{
int i = 0;
  
while (hexdec[i] != '\u0000') {
  
switch (hexdec[i]) {
case '0':
System.out.print("0000");
break;
case '1':
System.out.print("0001");
break;
case '2':
System.out.print("0010");
break;
case '3':
System.out.print("0011");
break;
case '4':
System.out.print("0100");
break;
case '5':
System.out.print("0101");
break;
case '6':
System.out.print("0110");
break;
case '7':
System.out.print("0111");
break;
case '8':
System.out.print("1000");
break;
case '9':
System.out.print("1001");
break;
case 'A':
case 'a':
System.out.print("1010");
break;
case 'B':
case 'b':
System.out.print("1011");
break;
case 'C':
case 'c':
System.out.print("1100");
break;
case 'D':
case 'd':
System.out.print("1101");
break;
case 'E':
case 'e':
System.out.print("1110");
break;
case 'F':
case 'f':
System.out.print("1111");
break;
default:
System.out.print("\nInvalid hexadecimal digit " + hexdec[i]);
}
i++;
}
}
  
void decToHexa(int n)
{
char[] hexaDeciNum = new char[100];

int i = 0;
while(n!=0)
{
int temp = 0;
temp = n % 16;

if(temp < 10)
{
hexaDeciNum[i] = (char)(temp + 48);
i++;
}
else
{
hexaDeciNum[i] = (char)(temp + 55);
i++;
}

n = n/16;
}

// printing hexadecimal number array in reverse order
for(int j=i-1; j>=0; j--)
System.out.print(hexaDeciNum[j]);
}
  
int hexaToDec(String hexVal)
{
int len = hexVal.length();
int base = 1;
int dec_val = 0;
  
for (int i=len-1; i>=0; i--)
{
if (hexVal.charAt(i) >= '0' && hexVal.charAt(i) <= '9')
{
dec_val += (hexVal.charAt(i) - 48)*base;
base = base * 16;
}

else if (hexVal.charAt(i) >= 'A' && hexVal.charAt(i) <= 'F')
{
dec_val += (hexVal.charAt(i) - 55)*base;
base = base*16;
}
}
return dec_val;
}
}