Question

In C++, Write the following program using a vector:

A common game is the lottery card. The card has numbered spots of which a certain number are selected at random. Write a Lotto() function that takes two arguments. The first should be the number of spots on a lottery card and the second should be the number of spots selected at random. The function should return a vector object that contains, in sorted order, the numbers selected at random. Use your function as follows:

Vector winners;

winners = Lotto(51,6);

This would assign to winners a vector that contains six numbers selected randomly from the range 1 through 51.

Also write a short program that lets you test the function,

Answer 1

Thanks for the question.

Here is the completed code for this problem.

Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change.

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//Header files for I/O,vector use and for shuffling and sort
#include <iostream>
#include<vector>
#include<algorithm>
using namespace std;
//Function prototype
vector<int> Lotto(int, int);
//Test
int main()
{
   //Declare a vector
   vector<int> winners;
   //Call function to get winners lotto
   winners = Lotto(51, 6);
   //Display lotto values
   for (int i = 0; i < winners.size(); i++) {
       cout << winners.at(i) << " ";
   }
   cout << endl;
}
/*
    Function to generate random lotto values
   Take maximum of random number and count of lotto number as parameter
   Return winners lotto vector
*/
vector<int> Lotto(int maxRand, int cnt) {
   //Return vector
   vector<int> winners;
   //Tempory vector
   vector<int> temp;
   //Put 1 to maxRand numbers
   for (int i = 1; i <= maxRand; i++) {
       temp.push_back(i);
   }
   //Shuffle the vector
   random_shuffle(temp.begin(), temp.end());
   ////Put first cnt of values into winners lotto
   for (int i = 0; i < cnt; i++) {
       winners.push_back(temp.at(i));
   }
   //Sort the vector ascending order
   sort(winners.begin(), winners.end());
   //Return resulting vector
   return winners;
}

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