CODEWITHSUNDEEP
c++c++11binaryformatstringstream
Nick
Nick

Reputation: 10499

std::string stream parse a number in binary format

I need to parse an std::string containing a number in binary format, such as:

0b01101101

I know that I can use the std::hex format specifier to parse numbers in the hexadecimal format.

std::string number = "0xff";
number.erase(0, 2);
std::stringstream sstream(number);
sstream << std::hex;
int n;
sstream >> n;

Is there something equivalent for the binary format?

Upvotes: 8

Views: 1643

Answers (2)

proton
proton

Reputation: 341

You can try to use std::bitset

for example:

skip two first bytes 0b

#include <bitset>
...
std::string s = "0b0111";
std::bitset<4>x(s,2); //pass string s to parsing, skip first two signs
std::cout << x;

char a = -20;    
std::bitset<8> x(a);
std::cout << x;

short b = -427;
std::bitset<16> y(c);
std::cout << y;

Upvotes: 0

Revolver_Ocelot
Revolver_Ocelot

Reputation: 8783

You can use std::bitset string constructor and convert bistet to number:

std::string number = "0b101";
//We need to start reading from index 2 to skip 0b
//Or we can erase that substring beforehand
int n = std::bitset<32>(number, 2).to_ulong();
//Be careful with potential overflow

Upvotes: 11

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