Learn C++: References and Pointers

                                
void swapNumbers(int &a, int &b) {
  int temp = a;
  a = b;
  b = temp;
}

int main() {
  int x = 10;
  int y = 20;
  swapNumbers(x, y);
  std::cout << "x is " << x << "\n";
  std::cout << "y is " << y << "\n";
}

                              

                                
int multiplyByThree(const int num) {
  return num * 3;
}

                              

                                
int value = 42;
int* ptr = &value; // ptr now holds the address of value

                              

                                
int original = 5;
int &alias = original; // alias is another name for original

                              

                                
int count = 10;
std::cout << &count << "\n"; // Prints the memory address of count 
std::cout << *(&count) << "\n"; // Dereferences the pointer to print the value at that address (10)


                              

                                
int number = 7;
int* ptr = &number; 
int value = *ptr; // value is now 7, the content of number