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How to find if Given number is power of 2 using C/C++ program. Number is a very very big number?

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How to find if Given number is power of 2 using C/C++ program. Number is a very very big number?
posted Dec 6, 2016 by anonymous

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#include <iostream>
using namespace std;

int main() {
    // your code goes here
    unsigned long long int num=2;
    num<<=62; // use  for( i =1 to 62 to check
    cout<<num;
    return 0;
}
i checked for num <= 9223372036854775808
commented Dec 6, 2016 by Shivam Kumar Pandey
http://ideone.com/WkOlMt
commented Dec 6, 2016 by Shivam Kumar Pandey

1 Answer

+1 vote

Hi,

very simple , if this condition satisfies then it is power of 2 if ( ! ( num & ( num - 1 ) ) )

answer Dec 7, 2016 by Jaganathan
Condition satisfies or condition fails?
commented Dec 7, 2016 by Salil Agrawal
ab0ve IF statement true means it is power of two
commented Dec 7, 2016 by Jaganathan
can you explain this
awsome
commented Apr 17, 2017 by Leon Martinović
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