The questions were : write a SV code to get unique random numbers, rand vs randc, write driver code etc.

Question

rand vs randc · Accepted Answer

rand , blindly randomizes based on constraints so there is no guarantee that elements would not get repeated before covering all the possible elements. 

randc guarantees that no elements would be repeated unless all the possible elements have been returned.

write a SV code to get unique random numbers · Answer

int arr[];
int len = 20; // For example
 arr = new[len];
foreach(arr[i]) arr[i] = i;  // assign index to elements so that they are unique
arr.shuffle(); // shuffle them to randomize

//// Keep shuffling once we used all 20 elements.

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