text: #define WIDTH 5
  #define HEIGHT 3
  
  #include <iostream>
  #include <cstdlib>
  #include <ctime>
  using namespace std;
  
  int main() {
      clock_t start = clock();
      int jimmy[HEIGHT][WIDTH];
      int n,m;
  
      for(n = 0; n < HEIGHT; n++) {
          for(m = 0; m < WIDTH; m++) {
              jimmy[n][m] = (n+1) * (m+1);
          }
      }
  
      for(n = 0; n < HEIGHT; n++) {
          for(m = 0; m < WIDTH; m++) {
              cout<<jimmy[n][m] << "\t";
          }
          cout<<"\n";
      }
  
      clock_t end = clock();
  
      double timediff = end - start;
      float executionTime = timediff/CLOCKS_PER_SEC;
      cout << "Execution time: " << executionTime << " sec."<< endl;
  
      return 0;
  }