Review

Enjoy the following last-minute extra practice problems! We'll go over these on Saturday morning if no one has any questions.

What will the following code print out?

  #include <iostream>
  #include <string>
  #include <cstring>
  using namespace std;
    
  const int MAX_LENGTH = 50;
  char arr[][2][MAX_LENGTH] = {
      {
          "CSTRINGS",
          "IN A"
      },
      {
          "SEA OF",
          "STRINGS"
      }
  };
      
  int main () {
      char* ptr1 = arr[0][0];
      cout << ptr1 << endl;           // #1
      cout << ptr1[0] << endl;        // #2
      cout << (ptr1 + 3) << endl;     // #3
  
      char* ptr2 = arr[1][1];
      ptr2[6] = 'Z';
      cout << ptr2 << endl;           // #4
  
      *ptr1 = *ptr2;
      cout << ptr1 << endl;           // #5
      cout << ptr2 << endl;           // #6
  }

Observe the two arrays arr and ans below. Your task is to turn each element of arr into the corresponding element of ans with the following restrictions:

You MUST use ONLY the cstring library's functions.
You MUST NOT assign to individual characters in the cstring using the [] operator.
You MUST NOT declare any additional variables.
You MUST NOT use ANY string literals like "string" in your answers.

  #include <iostream>
  #include <cstring>
  using namespace std;
  
  const int MAX_LENGTH = 50;
  
  char arr[][MAX_LENGTH] = {
      "SEE",
      "SAW",
      "C",
      "STRINGS"
  };
  
  char ans[][MAX_LENGTH] = {
      "SEESAW",
      "SAWINGS",
      "SEESEE",
      "RING"
  };
  
  int main () {
      // -----------------------------------
      // [!] Your code here!
      // -----------------------------------
  
      for (int i = 0; i < 4; i++) {
          if (strcmp(arr[i], ans[i])) {
              cout << "[X] FAILED: " << endl
                   << "EXPECTED: " << ans[i] << endl
                   << "GOT: " << arr[i];
  
              return 1;
          }
      }
  
      cout << "[!] You win CS31!" << endl;
  }