Answer / dan

if (x & (x-1)) // false only if x is a power of 2

Answer / vadivel

# include <stdio.h>

void main()
{
int n;
scanf("%d",&n);
if( n & (n-1) )
printf("Not a Power of 2");
else
printf("Power of 2");
}

Answer / ataraxic

Previous post -- It's wrong... absolutely...

Answer / phil

if (x && !(x & (x-1)) == 0)

Answer / jb

(x ^ x-1) == ((x << 1) - 1)

Answer / ashutosh

I think
if (x & (x-1)) wont work when number is negative.

Answer / natmat

(~i & (i-1)) == (i - 1))

Answer / fjords

if (int(log(x)) == log(x)) // log is to the base 2

Answer / rahul priyadarshi

#define ISPOW2(x) ((x==1)?1:(x&(x-1)))?0:1

Answer / yevgen

if ((num XOR (num - 1)) == num + num - 1) return true;
else return false;

main() { int i = 0xff ; printf("\n%d", i<<2); } a. 4 b. 512 c. 1020 d. 1024

2 Answers   HCL,

How can you relate the function with the structure? Explain with an appropriate example.

0 Answers  

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Write a program to receive an integer and find it's octal equivalent. How can i do with using while loop.

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How do you sort a Linked List (singly connected) in O(n) please mail to pawan.10k@gmail.com if u can find an anser...i m desperate to knw...

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Is the following code legal? typedef struct a aType; struct a { int x; aType *b; };

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void main() { int i=5; printf("%d",i+++++i); }

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how can u draw a rectangle in C

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main() { int i=-1; -i; printf("i = %d, -i = %d \n",i,-i); }

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main() { int i=5,j=6,z; printf("%d",i+++j); }

2 Answers