[Solved] Can someone explain this line of c++? [closed]

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Looks like my previous answer was a bit terse…

cout << results[rand()%(sizeof(results)/sizeof(results[0]))] << endl;

could be broken down to

int num_elems = sizeof(results)/sizeof(results[0]);
int randomIndex = rand() % num_elems;
int randomValue = results[randomIndex];
cout << randomValue << endl;

In slightly more detail:

  • sizeof(results)/sizeof(results[0]) calculates the number of elements in the array results. (Note that this only works when you have access to the array definition – you can’t use this with a pointer to an array.)
  • rand() % num_elems calculates a random number in the range [0..num_elems-1]; this is the range of the results array.
  • results[randomIndex] returns a single, randomly selected, element from results

solved Can someone explain this line of c++? [closed]