Give a oneline C expression to test whether a number is a
power of 2?

Answer Posted / nmk

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

bool isPowerOf2(int number){
if ( number > 0 )
return (number & (number-1)) == 0;

if (number == 0)
return false;

if (isPowerOf2(-number)){
int count=0;
while ( !(number & 1)) {
++count;
number >>= 1;
}
if (fmod(count,2))
return true;
else
return false;
}
return false;
}

int main(void) {
for(int i=-1027; i<1025; ++i){
if (isPowerOf2(i) )
printf("%d\n", i);
}

return EXIT_SUCCESS;
}

Is This Answer Correct ?    2 Yes 14 No



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