Question

I have used this library.
I have to perform bit operations on BigUnsigned numbers.

My code is

#include "BigIntegerLibrary.h"
BigUnsigned n1;

for (int i = 0; i < 100;i++)
{
    if (i < 5)
    {
        n1.setBit(i,true);
    }
    else
    {
        n1.setBit(i,false);
    }
}

BigUnsigned n2;
n2 = n1;
n2.bitShiftLeft(n2 , 40);

It gives me n2 is 0 instead of 34084860461056. Why is this happening?

Answer 1

It probably has something to do with the implementation of the library. I would highly recommend using GMP for this task. My solution would look something like this:

#include <iostream>
#include <gmpxx.h>
using namespace std;

int main() {

    mpz_class n2 = 0x1F;

    n2 <<= 40;

    cout << n2 << endl;

    return 0;
}