Simple C++ program to get given number of integers in random order from given interval.

/*
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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*/

#include <iostream>
#include <random>
#include <ctime>
#include <vector>

using namespace std;

int main() {
  unsigned int numberOfNumbers = 0;
  int intervalBegin = 0;
  int intervalEnd = 0;
  vector<int> generatedNumbers;

  mt19937 randomEngine;
  randomEngine.seed(time(nullptr)); //Seeding random engine with time 	

  cout << "Enter how much numbers you want to generate (0 - all from given interval)" << endl;
  cout << "> ";
  cin >> numberOfNumbers;

  cout << "Enter begin of interval" << endl;
  cout << "> ";
  cin >> intervalBegin;

  cout << "Enter end of interval" << endl;
  cout << "> ";
  cin >> intervalEnd;

  uniform_int_distribution<int> distribution(intervalBegin, intervalEnd); 
  int generatedNum = 0;
  bool repeat = false;
  bool wasFirstGenerated = false;

  if (numberOfNumbers <= 0) {
    numberOfNumbers = abs(intervalBegin - intervalEnd);
  }

  for (int i = 0; i < numberOfNumbers; i++) {
    generatedNum = distribution(randomEngine);

    if (!wasFirstGenerated) {
      generatedNumbers.push_back(generatedNum);

      wasFirstGenerated = true;
    }

    repeat = false;

    for (int j = 0; j < generatedNumbers.size(); j++) {
      if (generatedNum == generatedNumbers[j]) { //Check if number was generated
        i--;
        repeat = true;

        break;
      }
    }

    if (!repeat) { 
      cout << generatedNum << "\t";
      generatedNumbers.push_back(generatedNum);
    }
  }

  char a;
  cin >> a;
  return 0;
}

 

C++ All Random Numbers From Given Interval
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