c++ convert int to binary code example

Example 1: convert decimal to binary in c++

// C++ program to convert a decimal 
// number to binary number 
  
#include <iostream> 
using namespace std; 
  
// function to convert decimal to binary 
void decToBinary(int n) 
{ 
    // array to store binary number 
    int binaryNum[32]; 
  
    // counter for binary array 
    int i = 0; 
    while (n > 0) { 
  
        // storing remainder in binary array 
        binaryNum[i] = n % 2; 
        n = n / 2; 
        i++; 
    } 
  
    // printing binary array in reverse order 
    for (int j = i - 1; j >= 0; j--) 
        cout << binaryNum[j]; 
} 
  
// Driver program to test above function 
int main() 
{ 
    int n = 17; 
    decToBinary(n); 
    return 0; 
}

Example 2: convert int to binary string c++

std::string str = std::bitset<8>(123).to_string();

Example 3: convert long int to binary string c++

auto int_bits_size = 32; // maximum number of bits for the integer
auto some_integer = 123456789;
std::string str = std::bitset<int_bits_size>(some_integer).to_string();

Example 4: how to do decimal to binary converdsion in c++

// C++ program for decimal to binary 

#include <iostream>
#include <algorithm>
#include <string>
#include <vector>


using namespace std; 

int main() {

    vector<int>nums; // list that will hold binary values

    int num = 0; 
    cout<<"Number: "<<endl;
    cin>>num; // number input 
    int i=0; // iterator for vector

    while(num!=0)
    {
        nums.push_back(num%2); // adds binary value to the back of string 
        i++; // i gets incremented for the next position in vector 
        num=num/2; 
    }
 
    reverse(nums.begin(),nums.end()); // reverses order of vector 
  
    for(auto x:nums)
    {
        cout<<x; // outputs stuff in vector 
    }
  return 0; 
}