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Give a one-line C expression to test whether a number is a
power of 2.
- 10 Answers
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Answers were Sorted based on User's Feedback
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 ? | 36 Yes | 8 No |
Answer / fallen angel
if(x&(x-1)==0)
then TRUE;
else
FALSE;
use the bitwise and operator
| Is This Answer Correct ? | 24 Yes | 2 No |
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 ? | 2 Yes | 0 No |
Answer / rarach
if( (a == 2 ) || ((a/2) %2 == 0 ) && a !=1)
TRUE
else
false
| Is This Answer Correct ? | 1 Yes | 3 No |
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 |
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 | 5 No |
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 | 9 No |
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 |
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 |
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 |
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main() { int (*functable[2])(char *format, ...) ={printf, scanf}; int i = 100; (*functable[0])("%d", i); (*functable[1])("%d", i); (*functable[1])("%d", i); (*functable[0])("%d", &i); } a. 100, Runtime error. b. 100, Random number, Random number, Random number. c. Compile error d. 100, Random number
C Code 
