bitshift.cpp

#include <cinttypes>
#include <iostream>
using namespace std;

unsigned int intSetBit(unsigned int target, int bit)
{
    unsigned int mask = (1 << bit);
    return target | mask;
}

template <class T>
T setBit(T target, int bit)
{
    T mask = (1 << bit);
    return target | mask;
}

template <class T>
T clearBit(T target, int bit)
{
    T mask = (1 << bit);
    return target & (~mask);
}

template <class T>
bool testBit(T target, int bit)
{
    T mask = (1 << bit);
    return target & mask;
}

template <class T>
void printBits(T target)
{
    for(int bit = 8 * sizeof(T) -1; bit >=0 ; bit--) {
        cout << testBit(target,bit);
    }
}

template <class T>
T bit_rol(T t, int bits = 1)  // rol = rotate left
{
  return (t << bits) | (t >> (8*sizeof(T) - bits));
}

template <class T>
T bit_ror(T t, int bits = 1)  // ror = rotate right
{
  return (t >> bits) | (t << (8*sizeof(T) - bits));
}

int main(int argc, char ** argv, char ** env)
{
    for(int bit = 0; bit < 8; bit++ ) {
        unsigned int target  = 0;
        target = intSetBit(target, bit);
        cout <<"intSetBit: bit " << bit << " on, target = " << target << "\n";
    }

    for(int bit = 0; bit < 8; bit++ ) {
        unsigned int target  = 0;
        target = setBit(target, bit);
        cout <<"setBit (template function) bit " << bit << " on, target = " << target << "\n";
    }

    unsigned short target;
    cout << "sizeof(target) = "<< sizeof(target) << " bytes, " << 8 * sizeof(target) << " (bits)" << "\n";
    for(int bit = 0; bit < 8*sizeof(target); bit++ ) {
        target  = ~0;
        target = clearBit(target, bit);
        // cout <<"clearBit (template function) bit " << bit << " on, target = " << target << "\n";
        printBits(target);
        cout << "\n";
    }


	uint8_t A = 23;
	uint8_t B = 32;

	cout << "A = " << (int) A << "\n";
	cout << "B = " << (int) B << "\n";
	cout << "A="; printBits(A);  cout << "\n";
	cout << "B="; printBits(B);  cout << "\n";
	cout << "\n";

	A = A ^ B;
	cout << "after A = A ^ B;" << "\n";
	cout << "A="; printBits(A);  cout << "\n";
	cout << "B="; printBits(B);  cout << "\n";
	cout << "\n";

	B = A ^ B;
	cout << "after B = A ^ B;" << "\n";
	cout << "A="; printBits(A);  cout << "\n";
	cout << "B="; printBits(B);  cout << "\n";
	cout << "\n";

	A = A ^ B;
	cout << "after A = A ^ B;" << "\n";
	cout << "A="; printBits(A);  cout << "\n";
	cout << "B="; printBits(B);  cout << "\n";
	cout << "\n";

	cout << "A = " << (int) A << "\n";
	cout << "B = " << (int) B << "\n";

  for(int i = 0; i< 256; i++) {
    A = i;
    cout << "i=" << i  << " ";
         printBits(A); cout  << " ";
         printBits(bit_rol(A, 1)); cout << " ";
         printBits(bit_ror(A, 1));
         cout << "\n";
  }
}