**example :-**2= 2^1

4=2^2

8= 2^3 and so on .

__method 1:-__ In this method we will check by using log base 2 if

**ceil**and**floor**of log base of the number is same then number is a power of 2. ceil(3.56)=4

ceil(4.23)=5

floor(3.56)=3

floor(4.23)=4

__Code:-__#include <stdio.h>

#include<math.h>

int main()

{

int n;

printf("Enter a number\n");

scanf("%d",&n);

// logic for checking that

// number is power of 2 or not_

if (ceil(log2(n))==floor(log2(n)))

printf("Number is in power of 2");

else

printf("Number is not in power of 2");

return 0;

}

__Output:-__Enter a number

8

Number is in power of 2

**(keep diving by 2 until n become 1)**

__Method 2:-__ Keep divide the number by 2, until n becomes 1 ,(i.e, do n = n/2 iteratively). In any iteration, if n%2 becomes non-zero (i.e n is not divisible by 2) and n is not 1 then n is not a power of 2. If n becomes 1 then it is a power of 2.

__Code:-__#include <stdio.h>

int main()

{

int n,r,flag;

printf("Enter a number\n");

scanf("%d",&n);

// logic for checking that

// number is power of 2 or not_

flag=0;

while(n!=1)

{

r=n%2;

if(r!=0)

{

flag=1;

break;

}

n=n/2;

}

if(flag==1)

printf("Number is not power of 2");

else

printf("Number is power of 2");

return 0;

}

__Output:-__Enter a number

8

Number is in power of 2

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