Day 26 Recap Questions

  1. What is a C++ reference?

  2. When should you use C++ references?

  3. What is the difference between a pointer and a reference?

  4. What is the output of the following?

     #include <iostream>
	
 void modify(int& a, int& b) {
     a = a + b;
     b = a * 2;
 }
	
 int main() {
     int x = 3, y = 5;
     int& ref = x;   
	
     modify(ref, y); 
     ref = y;        
	
     std::cout << x << " " << y << " " << ref << std::endl;
     return 0;
 }
  5. How do you dynamically allocate and deallocate memory in C++?

  6. What is wrong with the following code?

     #include <iostream>
	
 using std::cout;
 using std::endl;
	
 int main() {
   double *d_array = new double[5];
   for(int i = 0; i < 5; i++) {
     d_array[i] = i;
   }
	
   delete d_array;
   return 0;
 }