C++ program to check if number is power of 2 using Bitwise operator

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mahmoud2506

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2022-05-05

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C++ program to check if number is power of 2 using Bitwise operator

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mahmoud2506

2022-05-05

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C++ implementation

// program to find that the number is power of 2
#include<iostream>
using namespace std;

int main()
{
	// declaring the array n
	int n[]={4,9,15,16,20,22,25,32,45,64,72,80,100,128,256};
	int i;
	
	for(i=0;i<15;i++)
	{
		cout<< n[i] << " is power of 2 : ";
		// use of bitwise AND (&) operator
		if((n[i]& (n[i]-1))==0) 
			cout<<"True"<<endl;
		else
			cout<<"False"<<endl;
	}
	
	return 0;	
}

Output

4 is power of 2 : True 
9 is power of 2 : False
15 is power of 2 : False 
16 is power of 2 : True
20 is power of 2 : False 
22 is power of 2 : False 
25 is power of 2 : False 
32 is power of 2 : True
45 is power of 2 : False 
64 is power of 2 : True
72 is power of 2 : False 
80 is power of 2 : False 
100 is power of 2 : False
128 is power of 2 : True 
256 is power of 2 : True

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