/******************************** * Just a bit of playing around * * with bit manipulation to * * store 4x 16-bit values * * inside a 64-bit value. * * * * Input 4 values from 0-65535 * * ******************************/ #include #include using std::cout; using std::cin; using std::endl; struct Multi { unsigned long long int data; Multi(unsigned long long int _hex); Multi(unsigned short, unsigned short, unsigned short, unsigned short); //only used for accessing, not for setting values unsigned short operator[](int idx); //usage: setValue(idx, value) void setValue(int, unsigned short); void printData(); void printHex(); }; int main() { unsigned short a, b, c, d; cin >> a >> b >> c >> d; Multi var(a, b, c, d); cout << "Your numbers: " << endl; var.printData(); cout << "\nHex value of all numbers: " << endl; var.printHex(); cout << "\nIndividual access to the numbers: " << endl; for (int i=0; i<4; i++){ cout << var[i] << " "; } cout << endl; cout << "\nSet some values: " << endl; var.data = 0x10920C45ABCD002A; var.printHex(); var.printData(); cout << "\nSet values to max value: " << endl; var.setValue(0, 0xFFFF); var.printData(); var.setValue(1, 0xFFFF); var.printData(); var.setValue(2, 0xFFFF); var.printData(); var.setValue(3, 0xFFFF); var.printData(); return 0; } Multi::Multi(unsigned long long int _hex){ data = _hex; } Multi::Multi(unsigned short a, unsigned short b, unsigned short c, unsigned short d){ setValue(0, a); setValue(1, b); setValue(2, c); setValue(3, d); } unsigned short Multi::operator[](int idx){ unsigned long long int _hex = data; for (int i=0; i> 16; } return (unsigned short)_hex; } void Multi::setValue(int idx, unsigned short value){ unsigned long long int _hex = data; //save current values unsigned short a = (unsigned short)_hex; _hex = _hex >> 16; unsigned short b = (unsigned short)_hex; _hex = _hex >> 16; unsigned short c = (unsigned short)_hex; _hex = _hex >> 16; unsigned short d = (unsigned short)_hex; //change value assigned to index switch(idx) { case 0: a = value; break; case 1: b = value; break; case 2: c = value; break; case 3: d = value; break; } //set base 0 _hex = 0; //fill base _hex = _hex | d; // 0 0 0 D _hex = _hex << 16; // 0 0 D 0 _hex = _hex | c; // 0 0 D C _hex = _hex << 16; // 0 D C 0 _hex = _hex | b; // 0 D C B _hex = _hex << 16; // D C B 0 _hex = _hex | a; // D C B A //update member variable data = _hex; } void Multi::printData(){ unsigned long long int _hex = data; cout << "| " << std::dec << (unsigned short) _hex << " | "; for (int i=2; i>-1; i--){ _hex = _hex >> 16; cout << std::dec << (unsigned short) _hex << " | "; } cout << endl; } void Multi::printHex(){ cout << std::hex << std::uppercase << data << std::dec; cout << endl; }

Shift happens