Give a one-line C expression to test whether a number is a
power of 2.




Answers were Sorted based on User's Feedback



Give a one-line C expression to test whether a number is a power of 2...

Answer / lakshmi

void main()
{
int a;
scanf("%d",&a);

if((a&a-1)==0)
printf("Is a power of 2");
else
printf("Not a power of 2");
}

Is This Answer Correct ?    31 Yes 8 No

Give a one-line C expression to test whether a number is a power of 2...

Answer / fallen angel

if(x&(x-1)==0)
then TRUE;
else
FALSE;

use the bitwise and operator

Is This Answer Correct ?    20 Yes 2 No

Give a one-line C expression to test whether a number is a power of 2...

Answer / mayur shankariya

#include<stdio.h>
main()
{
int num;
printf("Enter Number
");
scanf("%d",&num);
(num & num - 1)? printf("Not
"):printf("Power of two
");
}

Is This Answer Correct ?    1 Yes 0 No




Give a one-line C expression to test whether a number is a power of 2...

Answer / rarach

if( (a == 2 ) || ((a/2) %2 == 0 ) && a !=1)
TRUE
else
false

Is This Answer Correct ?    1 Yes 1 No

Give a one-line C expression to test whether a number is a power of 2...

Answer / rohit

if((log(n)/log(2))/floor(log(n)/log(2))==1)
then TRUE;
else FALSE;

Is This Answer Correct ?    1 Yes 5 No

Give a one-line C expression to test whether a number is a power of 2...

Answer / ramesh b penchal

#include<stdio.h>
main()
{
int n,i,d,m;
printf("Enter a number");
scanf("%d",&n);
m=n;
while(n>0)
{
d=n%10;
if(d!=0)
{
prntf("%d is not power of 2",m);
getch();
exit();
}
n=n/10;
}
prntf("%d is power of 2",m);
getch();
}

Is This Answer Correct ?    0 Yes 4 No

Give a one-line C expression to test whether a number is a power of 2...

Answer / santhoo035

#include<iostream.h>
int main()
{
int n,i;
cout<<"Enter a number";
cin>>n;
for(i=1;i<n/2;i++)
{
if((2<<i)==n)
{
cout<<"The given no is power of 2";
break;
}
}
}

Is This Answer Correct ?    3 Yes 8 No

Give a one-line C expression to test whether a number is a power of 2...

Answer / akshay rastogi

#include<conio.h>
void main()
{
int n,i=0,num=0;
printf("\n enter any number");
scanf("%d",&n);
while(num<=n)
{
i++;
num=2^i;
}
if(num==n)
printf("yes no. is power of 2");
else
printf("no.");
}

Is This Answer Correct ?    0 Yes 6 No

Give a one-line C expression to test whether a number is a power of 2...

Answer / abc def

/*following expr evaluates to true if num is a power of
2.Else it's false. '&' - bitwise and.*/
(num == 1) || !(num & 1)

Is This Answer Correct ?    0 Yes 9 No

Give a one-line C expression to test whether a number is a power of 2...

Answer / trailokya ranjan jena

#include<stdio.h>
void main()
{
int i,j;
clrscr();
printf("\n Enter a num");
scanf("%d",&i);
j=i;
for(;i%2==0;i/=2);
if(i==1)
printf("\n%d is power of 2",j);
else
printf("\n%d is not a power of 2");
getch();
}

Is This Answer Correct ?    4 Yes 18 No

Post New Answer



More C Code Interview Questions

int i; main(){ int t; for ( t=4;scanf("%d",&i)-t;printf("%d\n",i)) printf("%d--",t--); } // If the inputs are 0,1,2,3 find the o/p

2 Answers  


Given an array of size N in which every number is between 1 and N, determine if there are any duplicates in it. You are allowed to destroy the array if you like.

21 Answers   Google, Goldman Sachs, eBay, ABC, Microsoft, HUP, TATA,


How we print the table of 2 using for loop in c programing?

14 Answers   Wipro, HCL,


void main() { int i; char a[]="\0"; if(printf("%s\n",a)) printf("Ok here \n"); else printf("Forget it\n"); }

3 Answers   Accenture,


void main() { char far *farther,*farthest; printf("%d..%d",sizeof(farther),sizeof(farthest)); }

2 Answers  






main() { int i=_l_abc(10); printf("%d\n",--i); } int _l_abc(int i) { return(i++); }

2 Answers  


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

1 Answers  


write a c-program to find gcd using recursive functions

5 Answers   HTC, Infotech,


main() { int *j; { int i=10; j=&i; } printf("%d",*j); }

9 Answers   HCL, Wipro,


void main() { int i=i++,j=j++,k=k++; printf(ā€œ%d%d%dā€,i,j,k); }

1 Answers  


Write a Program that Inputs 10 Numbers in an Array and Show the Maximum Number

2 Answers   Ace Info,


&#8206;#define good bad main() { int good=1; int bad=0; printf ("good is:%d",good); }

2 Answers  






Categories