How to convert an int to a binary string representation in C++

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I have an int that I want to store as a binary string representation. How can this be done?

Try this:

#include <bitset>
#include <iostream>
int main()
    std::bitset<32>      x(23456);
    std::cout << x << "\n";

    // If you don't want a variable just create a temporary.
    std::cout << std::bitset<32>(23456) << "\n";

How to convert integer to binary string in C#?, Almost all computers today use two's complement representation internally, so if you do a straightforward conversion like this, you'll get the  Converting an int to a binary string in C# The .NET Framework has a built in overload of Convert.ToString which takes 2 parameters: the int you want to convert and an int of the base you want to convert to.

I have an int that I want to first convert to a binary number.

What exactly does that mean? There is no type "binary number". Well, an int is already represented in binary form internally unless you're using a very strange computer, but that's an implementation detail -- conceptually, it is just an integral number.

Each time you print a number to the screen, it must be converted to a string of characters. It just so happens that most I/O systems chose a decimal representation for this process so that humans have an easier time. But there is nothing inherently decimal about int.

Anyway, to generate a base b representation of an integral number x, simply follow this algorithm:

  1. initialize s with the empty string

  2. m = x % b

  3. x = x / b

  4. Convert m into a digit, d.

  5. Append d on s.

  6. If x is not zero, goto step 2.

  7. Reverse s

Step 4 is easy if b <= 10 and your computer uses a character encoding where the digits 0-9 are contiguous, because then it's simply d = '0' + m. Otherwise, you need a lookup table.

Steps 5 and 7 can be simplified to append d on the left of s if you know ahead of time how much space you will need and start from the right end in the string.

In the case of b == 2 (e.g. binary representation), step 2 can be simplified to m = x & 1, and step 3 can be simplified to x = x >> 1.

Solution with reverse:
#include <string>
#include <algorithm>

std::string binary(unsigned x)
    std::string s;
        s.push_back('0' + (x & 1));
    } while (x >>= 1);
    std::reverse(s.begin(), s.end());
    return s;
Solution without reverse:
#include <string>

std::string binary(unsigned x)
    // Warning: this breaks for numbers with more than 64 bits
    char buffer[64];
    char* p = buffer + 64;
        *--p = '0' + (x & 1);
    } while (x >>= 1);
    return std::string(p, buffer + 64);

Converting an int to a binary string in C, ToString which takes 2 parameters: the int you want to convert and an int can print out the string representation of a number in binary, like so: There are several ways to convert an integer to binary format in C# – 1. Convert.ToString Method The recommended approach is to use built-in method Convert.ToString for converting a signed integer value to its …

Program for Decimal to Binary Conversion, C++ program to convert a decimal function to convert decimal to binary array to store binary number. int binaryNum[32];. // counter for binary array. int i = 0;. Sometimes it’s useful to output the binary representation of a number in text, i.e. as an ASCII string of 0’s and 1’s. There are also situations where you might want convert back the other way, e.g. if you want to let a user enter a binary string manually. The bitset class in C++ makes this surprisingly quick and easy. Number to binary string

AND the number with 100000..., then 010000..., 0010000..., etc. Each time, if the result is 0, put a '0' in a char array, otherwise put a '1'.

int numberOfBits = sizeof(int) * 8;
char binary[numberOfBits + 1];
int decimal = 29;

for(int i = 0; i < numberOfBits; ++i) {
    if ((decimal & (0x80000000 >> i)) == 0) {
        binary[i] = '0';
    } else {
        binary[i] = '1';
binary[numberOfBits] = '\0';
string binaryString(binary);

Binary representation of a given number, To print binary representation of unsigned integer, start from 31th bit, check whether 31th bit is ON or C++ Program for the binary Steps to convert decimal number to its binary representation are given below: required to form given binary string where every flip changes all bits to its right as well · C program to count  Given an binary string as input, we need to write a program to convert the binary string into equivalent integer. To convert an binary string to integer, we have to use Convert.ToInt32(String, Base/Int32) function to convert the values. The base of the binary is 2. Syntax: Convert.ToInt32(String, Base/Int32); Examples:

I assume this is related to your other question on extensible hashing.

First define some mnemonics for your bits:

const int FIRST_BIT = 0x1;
const int SECOND_BIT = 0x2;
const int THIRD_BIT = 0x4;

Then you have your number you want to convert to a bit string:

int x = someValue;

You can check if a bit is set by using the logical & operator.

if(x & FIRST_BIT)
    // The first bit is set.

And you can keep an std::string and you add 1 to that string if a bit is set, and you add 0 if the bit is not set. Depending on what order you want the string in you can start with the last bit and move to the first or just first to last.

You can refactor this into a loop and using it for arbitrarily sized numbers by calculating the mnemonic bits above using current_bit_value<<=1 after each iteration.

Convert a number to a binary string (and back) in C++, Sometimes it's useful to output the binary representation of a number in text, i.e. as an ASCII string of 0's and 1's. There are also situations  1100 in binary = 12 in decimal = c in hex. It might sound weird converting a string to a decimal number but actually it is very straightforward because of the way strings are handled in

Represent Int32 as a Binary String in C, Firstly, set an Int64 variable − int val = 30;. Now, convert it to a binary string by including 2 as the second parameter. Convert.ToString(val, 2)  Decimal to binary in C programming: C program to convert an integer from decimal number system (base-10) to binary number system (base-2). Size of an integer is assumed to be 32 bits. We will use the bitwise operator "AND" to perform the desired task.

Is there a function in C that converts an integer into bits?, Here's what I came up with: [code c]char *int2bin(int n) { // det have a non-​ANSI function itoa() that will convert the integer to an ASCII string of "1" I've modified Costya Perepelitsa 's method a bit to print in a more readable format, along  C-string beginning with the representation of an integral number. Return Value On success, the function returns the converted integral number as an int value. If the converted value would be out of the range of representable values by an int, it causes undefined behavior.

Java program to convert decimal to binary, There are three following ways to convert Decimal number to binary number: 1) Using 1) Using toBinaryString() method of Integer class. class DecimalBinaryExample{ public static void main(String a[]){ System.out.println("​Binary representation of 124: "); System.out.println(Integer. C Programs · Java Programs  Converting from binary string to int . To convert a given binary string into an integer, we use Convert.ToInt32(String, Base/Int32) method. Syntax: Convert.ToInt32(String, Base/Int32); Here, String is a String object that should contain a binary value and Base/Int32 is an integer type of object which specifies the base of the input string. Here

  • Integers (and all other data) are already stored in binary. There is no "convert."
  • Do you want it stored in a string as binary (e.g. 0x1e3f : 4bytes, useful to store data in a file) or character representation of binary (e.g. 10110111... : 32bytes, not useful at all)?
  • I want a character representation of binary. Like 10101011101.
  • @Shaggy: If it is homework it looks like it is a small part of a bigger project:… . With extendible hashing you look at your hash as a bit string, maybe not literally but maybe for logging/debugging purposes.
  • This post may help…
  • This is guaranteed to work, the accepted answers had issues with leading zeros in my case.
  • @FredOverflow Could you explain more what does x>>=1 mean/does?
  • @AK_ It means "shift all the bits inside x one to the right". For unsigned integers, it has the exact same semantics as x /= 2.
  • @fredOverflow It is still not clear - I know that x>>1 means shift to the right by one but here you wrote while(x>>=1) does it mean shift by 1 and check if it is a 1 then continue looping? what if x=10000011b? won't that loop break at the 3rd shift to the right? - thanks again!
  • @AK_ No, the "condition" becomes false when the value of x is 0; that is, when all bits are 0.
  • I don't want to just print a binary number, I want to store it in a string.
  • No, the answer isn't perfect, but why don't you think about it and then you'll know forever?
  • You don't need to "print" it. Imagine he said "put the result on the end of the string buffer".
  • +1 for researching the user's other posts (and for the answer itself)