C++ - Decimal to binary converting

Question

I wrote a \'simple\' (it took me 30 minutes) program that converts decimal number to binary. I am SURE that there\'s a lot simpler way so can you show me? Here\'s the code:<

Answer 1

// function to convert decimal to binary
void decToBinary(int n)
{
    // array to store binary number
    int binaryNum[1000];

    // 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];
}

refer :- https://www.geeksforgeeks.org/program-decimal-binary-conversion/

or using function :-

#include
using namespace std;

int main()
{

    int n;cin>>n;
    cout<(n).to_string()<

or using left shift

#include
using namespace std;
int main()
{
    // here n is the number of bit representation we want 
    int n;cin>>n;

    // num is a number whose binary representation we want
    int num;
    cin>>num;

    for(int i=n-1;i>=0;i--)
    {
        if( num & ( 1 << i ) ) cout<<1;
        else cout<<0;
    }


}