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void getBitwiseRepresentation(int n) {
for (int i = 31; i >= 0; --i)
std::cout << ((n & (1 << i)) != 0);
}
void flipFourthBit(int& n) {
int mask = 1 << 3;
n = n ^ mask;
}
int numberOfZeroesInBinaryRepresentation(int n) {
int cnt = 0;
for (int i = 0; i < 32; i++)
cnt += ((n & (1 << i)) == 0);
return cnt;
}
void setBit(int& n, int bitPosition, bool newBitValue) {
int mask = 1 << bitPosition;
bool oldBitIsOne = ((mask & n) != 0);
if (oldBitIsOne ^ newBitValue) n = n ^ mask;
}
void printSubset(int arr[], int length, int indexOfSet) {
std::cout << "[";
int commas = 0;
int numberOfOnes = 32 - numberOfZeroesInBinaryRepresentation(indexOfSet);
for (int i = 0; i < length; i++) {
if (((indexOfSet & (1 << i)) != 0)) {
std::cout << arr[i];
if (++commas < numberOfOnes)
std::cout << ", ";
}
}
std::cout << ']' << std::endl;
}
void generateSubsets(int arr[], int length) {
int border = 1 << length;
for (int i = 0; i < border; i++)
printSubset(arr, length, i);
}
//bonus: function to change the sign of a number
void changeSign(int& n) {
n = ~n + 1;
}
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