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decimal to binary , decimal to octal , decimal to hexadeciaml conversions and vice versa programs in java

 binary to decimal conversion


code:
import java.util.*;
import java.lang.*;
import java.io.*;
//binary to decimal
class Test {
public static void main(String[] args){
Scanner scn = new Scanner(System.in);
//take the binary number from the user
int bin = scn.nextInt();

//write the lgic to convert it into decimal
int dec = 0;
int i = 0;//digit place
while(bin!=0){
//last digit
int r = bin%10;
//multiple remaider with 2 power digit place
dec = dec +(r* (int)Math.pow(2,i));
//increment the position of i
i++;
//remove the last digit from the number
bin = bin/10;
}

//print the decimal number
System.out.println(dec);
}
}

ex::
input : 1010
o/p: 10

input : 1000
o/p: 8




octal to decimal Conversion


Code::
import java.util.*;
import java.lang.*;
import java.io.*;
//binary to decimal
class Test {
public static void main(String[] args){
Scanner scn = new Scanner(System.in);
//take the octal number from the user
int oct = scn.nextInt();

//write the lgic to convert it into decimal
int dec = 0;
int i = 0;//digit place
while(oct!=0){
//last digit
int r = oct%10;
//multiple remaider with 8 power digit place
dec = dec +(r* (int)Math.pow(8,i));
//increment the position of i
i++;
//remove the last digit from the number
oct = oct/10;
}

//print the decimal number
System.out.println(dec);
}
}

ex:
i/p: 30
o/p: 24

i/p:40
o/p: 32


hexadecimal to decimal


code:

import java.util.*;
import java.lang.*;
import java.io.*;
//hexadecimal to decimal
class Test {
public static void main(String[] args){
Scanner scn = new Scanner(System.in);
System.out.println("Enter the hexadecimal number ");
String hexaString = "0123456789ABCDEF";
String hex = scn.next();
hex = hex.toUpperCase();
int dec = 0;
int pow = 0;
for(int i=hex.length()-1;i>=0;i--){
char ch = hex.charAt(i);
int num = hexaString.indexOf(ch);
dec = dec + ((num)*(int)Math.pow(16,pow));
pow++;
}
System.out.println(dec);
}
}


ex:
i/p: F1

o/p:  241

i/p: F
o/p: 15

Decimal to binary Conversion


Code::

import java.util.*;
import java.lang.*;
import java.io.*;
//decimal to binary
class Test {
public static void main(String[] args){
Scanner scn = new Scanner(System.in);
System.out.println("Enter the decimal number : ");
int dec = scn.nextInt();
String s = "";
while(dec!=0){
int r = dec%2;
s =  String.valueOf(r) + s;
dec = dec/2;
}
System.out.println(s);
}
}
ex:
i/p : 1010
o/p: 10

i/p: 1000
o/p: 8


Decimal to Octal Conversion


Code::

import java.util.*;
import java.lang.*;
import java.io.*;
//decimal to octal
class Test {
public static void main(String[] args){
Scanner scn = new Scanner(System.in);
System.out.println("Enter the decimal number : ");
int dec = scn.nextInt();
String s = "";
while(dec!=0){
int r = dec%8;
s =  String.valueOf(r) + s;
dec = dec/8;
}
System.out.println(s);
}
}


ex:
i/p: 40
o/p: 50


Decimal to HexaDecimal



Code::

import java.util.*;
import java.lang.*;
import java.io.*;
//decimal to hexadecimal
class Test {
public static void main(String[] args){
Scanner scn = new Scanner(System.in);
String hexaString = "0123456789ABCDEF";
System.out.println("Enter the decimal number : ");
int dec = scn.nextInt();
String s = "";
while(dec!=0){
int r = dec%16;
if(r>9){
char ch = hexaString.charAt(r);
s = ch + s;
}else{
s =  String.valueOf(r) + s;
}
dec = dec/16;
}
System.out.println(s);
}
}


ex::
i/p: 500
o/p: 1F4





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