How do I print out an unsigned int in binary in C++?

Question

I am trying to print out an unsigned value in binary in C++. I have found many hacks for this task such as

http://www.java2s.com/Tutorial/Cpp/0040__Data-Types/Printinganunsignedintegerinbits.htm

However, I feel that there should be a much more straightforward way, perhaps with sprintf. After all, there are very straightforward ways to print a value in hex or octal.

Ed Heal · Accepted Answer · 2013-03-10 05:19:04Z

7

Simple - Use STL bitset:

e.g.

bitset<10> n (120ul); // 10 bits in this case cout << n.to_string() << endl;

answered Mar 10, 2013 at 5:19

Ed Heal

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John Smith · Accepted Answer · 2013-03-10 05:01:54Z

4

printf familiy does not support base-2 printing. You need to use a custom or non-standard function, such as itoa (just set the base/radix to 2).

answered Mar 10, 2013 at 5:01

John Smith

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1 Comment

Dmytro Over a year ago

Indeed, there is no way to write a base two printf/cout without resorting to bit masking and shifting. Although you can resort to other magic, or look around for libraries that do support it.

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