top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

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

0 votes
792 views
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

Share this question
Facebook Share Button Twitter Share Button LinkedIn Share Button
#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
Similar Questions
0 votes
C program to find and print second largest digit in the given number?

C program to find and print second largest digit in the given number? (without using arrays, functions and using only one loop).

–1 vote
Write a C program to check if the given string is repeated substring or not?.

Write a C program to check if the given string is repeated substring or not.
ex
1: abcabcabc - yes (as abc is repeated.)
2: abcdabababababab - no

...