Apr 10 In-Class

Note

There are no wrong answers. This is for participation credit, and is intended to let me know how well we understand the material at this point.

Access the form: https://forms.gle/8zfGbH52q3EBKvZF7

1. Consider the following:

   double x{10.0};
   double *p = &x;
   

   How do we see the value in the memory location that p is pointing to?

   solution

   We deference it as *p.

2. Consider the following—what do you think the output printed to the screen is?

   #include <vector>
   #include <algorithm>
   #include <iostream>
   
   bool is_even(int e) {
       return e % 2 == 0;
   }
   
   int main() {
   
       std::vector<int> vec{1, 2, 3, 4, 5, 6, 7, 8};
       auto val = std::ranges::count_if(vec, is_even);
   
       std::cout << val << std::endl;
   }
   

   solution

   This will only count the elements in the vector for which is_even returns true, so we will get 4.