CODEWITHSUNDEEP
c++binary
Andrei Paciurca
Andrei Paciurca

Reputation: 483

How to convert binary into decimal using <bitset> library?

I use this simple code to convert a decimal into binary : 

#include <iostream>
#include <windows.h>
#include <bitset>
using namespace std;

int main(int argc, char const *argv[]){

    unsigned int n;
    cout << "# Decimal:  "; cin >> n; cout << endl;
    bitset<16>binary(n);
    cout << endl << "# Binary:  " << binary << endl;

    system("Pause"); return 0;
}

How to convert "binary" into decimal and assign the value to other variable ?

Upvotes: 0

Views: 8189

Answers (1)

Lightness Races in Orbit
Lightness Races in Orbit

Reputation: 385144

n is not "a decimal". I think you have a misconception of what numbers are, based on the default output representation used by IOStreams. They are numbers. Not decimal strings, binary strings, hexadecimal strings, octal strings, base-64 strings, or any kind of strings. But numbers.

The way you choose to represent them on output is entirely orthogonal to the way they are stored internally (which is, actually, base-2 not decimal), so it is highly likely that these "conversions" you're trying to do are inappropriate.

However, if you wish to extract an integer from a std::bitset instance, you may do so using the to_ulong() member function.

Get into the habit of using the documentation.

Upvotes: 2

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