Convert an integer to a binary string?

Question

I have to convert an integer (from 0 to 225) to an 8 char binary string, I have been trying to use bitset but I'm not having any luck. How can I intake an integer and convert it to an 8 char binary string?

Welcome to Stack Overflow! Can you show us what you've tried so far? — templatetypedef
– templatetypedef, Commented Oct 23, 2017 at 22:17
Write a loop that gets each bit from the integer, and then adds the character '0' or '1' to the string depending on the value of the bit. — Barmar
– Barmar, Commented Oct 23, 2017 at 22:20
Search a little harder, this has been asked, and answered, at least half a dozen times just counting StackOverflow. — Ben Voigt
– Ben Voigt, Commented Oct 23, 2017 at 22:20
I ended up using a while loop instead, thanks while(val!=0) { s = (val%2==0 ? "0":"1") + s; val/=2;} — sam
– sam, Commented Oct 24, 2017 at 1:22

Stephan Lechner · Accepted Answer · 2017-10-23 22:25:28Z

2

You are on a good way using bitset, I think. Don't know which issues you had with bitset, but try the following. Note that a bitset can be initialized with various types of values, one being integral type:

int main() {
    int value = 201;
    std::bitset<8> bs(value);
    cout << bs.to_string();
}

answered Oct 23, 2017 at 22:25

Stephan Lechner

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Comments

Cody · Accepted Answer · 2017-10-23 23:28:24Z

0

This is pretty easy to do without bitset, just as an alternate solution:

std::string ucharToBitString(unsigned char x)
{
    std::string s = "";
    for(int i = 0; i < 8; i++)
    {
        s += (x & 128) ? "1" : "0" ;
        x <<= 1;
    }
    return s;
}

Edit: As per the comment, this handles the most significant bit first.

edited Oct 23, 2017 at 23:28

answered Oct 23, 2017 at 23:22

Cody

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2 Comments

Thomas Matthews Over a year ago

You might want to indicate whether this is Most Significant Bit first or Least Significant Bit first.

sam Over a year ago

Thanks for the reply, I ended up using a while loop!

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