Generating Unique Random Numbers?

#include <iostream>
#include <ctime>
#include <conio.h>

using namespace std;

int LinearSearch(const int number[], int value) //Determines if the given number already exists
{
    int index = 0;
    int position = -1; 
    bool found = false; //Bool for duplicate number

    while (index < 15 && !found)
    {
        if (number[index] == value) //If any integer in the list is equal to the new
        {                           //random number
            found = true; //Sets bool to true because it found a duplicate
            position = index; //Sets position to where it found the duplicate
        }
        index++; //Increments through the list of numbers
    }
    return position; //Returns -1 if number is unique, else if duplicate is found
}



int main(){
    int question[14]; //List of numbers
    int temp; //Random number holder
    unsigned seed = time(NULL);
    srand(seed);

    for(int i=0; i < 15; i++){
        question[i]=0; //Set all integers in array to 0
    }

      for(int i = 0; i < 15; i++)
      {
      do {
      temp = rand() % 15 + 1; // Generate random number
      } 
      while (LinearSearch(question, temp) != -1); // Call function to check for duplicates of randomly generated number
                                                  //Repeats proccess until return value is equal to -1
      question[i] = temp; // If it's unique then save the number
      cout << question[i] << endl; //Print to screen
      }
    getch(); //Wait for user to press any key
    }