Test: off_by_one.cpp
off_by_one.cpp: In function 'void printTopRow()':
off_by_one.cpp:3:10: error: 'cout' is not a member of 'std'
    3 |     std::cout << "Top row: ";
      |          ^~~~
off_by_one.cpp:1:1: note: 'std::cout' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
  +++ |+#include <iostream>
    1 | // Matrix class - fix off-by-one bug in printTopRow
off_by_one.cpp:5:14: error: 'cout' is not a member of 'std'
    5 |         std::cout << data_[0][i] << " ";
      |              ^~~~
off_by_one.cpp:5:14: note: 'std::cout' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
off_by_one.cpp:5:22: error: 'data_' was not declared in this scope
    5 |         std::cout << data_[0][i] << " ";
      |                      ^~~~~
off_by_one.cpp:7:10: error: 'cout' is not a member of 'std'
    7 |     std::cout << std::endl;
      |          ^~~~
off_by_one.cpp:7:10: note: 'std::cout' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
off_by_one.cpp:7:23: error: 'endl' is not a member of 'std'
    7 |     std::cout << std::endl;
      |                       ^~~~
off_by_one.cpp:1:1: note: 'std::endl' is defined in header '<ostream>'; did you forget to '#include <ostream>'?
  +++ |+#include <ostream>
    1 | // Matrix class - fix off-by-one bug in printTopRow