Printing integers in binary format

ROOT
1

Hello,

I’m using ROOT as a command line calculator and I’m very happy with it. I just wonder whether there is an easy way to display integers in binary format. Something like

root [0] itoa(5) 101

Thanks, Kašpi.

2

root [0] for ( int i = 31; i >= 0; i-- ) cout << (5 >> i & 1); cout << endl;
00000000000000000000000000000101

Or, if you just want to be able to read the binary yourself, hex is considerably easier to read.

root [1] cout << hex << 65535 << endl;
ffff

The ‘hex’ keyword is located in the header, so if you want to use it in a compiled program, you need to #include followed by using std::hex; or using namespace std;

cplusplus.com/reference/iost … s/hex.html

en.wikipedia.org/wiki/Hexadecimal#Uses

The important thing to realise is that each hexadecimal digit means 4 bits. So FF = 1111 1111, F1 = 1111 0001, etc.

HTH.

  • Peter
3

Hi,

also, CINT offers a custom “%b” format specifier: printf("%b\n",5); will display 101.

Cheers, Axel.

4

Thanks very much. This is the sort of thing I was looking for.

Cheers, Kaspi.