Answer Posted / hassan noureddine

To be a power of 2 number,is to have a single 1 bit, and the
rest bits are zeros, lik2 1, 2, 4 , 8, 16, 32, 64, 128, ...

the bitsize of the number is sizeof(number) * 8

isPowerOf2() returns 1 if successful, or 0 (false) otherwise
int isPowerOf2 (number)
{
int foundOnes = 0;
int bitsize = sizeof(number) * 8;

for (i = 0; i < bitsize; i++)
{
if (number & 1)
{
if(++foundOnes > 1)
return false;
/* shift the number to the right */
number >> 1;
}
}
return foundOnes;
}

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