Decimal to Hex Conversion C++ Built-In Function

Decimal to hex conversion c++ built-in function

Decimal to hex :-

std::stringstream ss;
ss<< std::hex << decimal_value; // int decimal_value
std::string res ( ss.str() );

std::cout << res;

Hex to decimal :-

std::stringstream ss;
ss  << hex_value ; // std::string hex_value
ss >> std::hex >> decimal_value ; //int decimal_value

std::cout << decimal_value ;

Ref: std::hex, std::stringstream

How to make a decimal to hexadecimal converter in C

Make an array and write the remains in it:

int array[50];
int counter=0;

[...]

while(number!=0)
{
   [...]

   array[counter]=number%16;
   number/=16;
   ++counter;
}

The line array[counter]=number%16; means that the first element in the array will be number%16 - the second will be (number/16)%16 etc.

You need the counter to know how many elements there is in the array (how much remains), so that you can later write them backwards.

(Take into consideration here that you have a limit - int array[50]; because, what happens if your number is really big and you have more than 50 remains? The solution would be to write this dynamically, but I don't think you should worry about that at this point.)

Converts Decimal To Hexadecimal In C++

you can have from decimal to hex

std::stringstream ss;
ss<< std::hex << decimal_value; // int decimal_value
std::string res ( ss.str() );

std::cout << res;

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Integer to hex string in C++

Use <iomanip>'s std::hex. If you print, just send it to std::cout, if not, then use std::stringstream

std::stringstream stream;
stream << std::hex << your_int;
std::string result( stream.str() );

You can prepend the first << with << "0x" or whatever you like if you wish.

Other manips of interest are std::oct (octal) and std::dec (back to decimal).

One problem you may encounter is the fact that this produces the exact amount of digits needed to represent it. You may use setfill and setw this to circumvent the problem:

stream << std::setfill ('0') << std::setw(sizeof(your_type)*2) 
       << std::hex << your_int;

So finally, I'd suggest such a function:

template< typename T >
std::string int_to_hex( T i )
{
  std::stringstream stream;
  stream << "0x" 
         << std::setfill ('0') << std::setw(sizeof(T)*2) 
         << std::hex << i;
  return stream.str();
}

How to convert decimal to hexadecimal in JavaScript

Convert a number to a hexadecimal string with:

hexString = yourNumber.toString(16);

And reverse the process with:

yourNumber = parseInt(hexString, 16);

How to convert numbers between hexadecimal and decimal

To convert from decimal to hex do...

string hexValue = decValue.ToString("X");

To convert from hex to decimal do either...

int decValue = int.Parse(hexValue, System.Globalization.NumberStyles.HexNumber);

or

int decValue = Convert.ToInt32(hexValue, 16);

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