C++ array

[Myna]

I need help writing a lottery program that generates 5 non duplicate numbers that is between 1 and 20 by using arrays. Here is my code and i cant compile it.

#include <iostream>
#include <stdlib.h>
#include <time.h>
#include <iomanip>

using namespace std;

int main()
{
	srand(time(NULL));

	int lottery[5] = { 0, 0, 0, 0, 0 }, count = 0, rand_lottery;
	bool isdup = false;

	cout << "Your Lottery:" << endl;

	while (count < 5)
	{
		int rand_lottery, i;
		rand_lottery = rand()%20 +1;
		i =  lottery[5]
		for (int i = 0; i < 5; i++);
		{
				if (lottery[i] == rand_lottery)
				{
					isdup = true;
				}
		}
		if (isdup == false)
		{ 
			lottery[count] = rand_lottery;
			count++;
		}
	}
	for (int i = 0; i < 5; i++)
	{
		cout << lottery[i] << " ";

		return (0);

	}
}

[Konstantin2]

What is in line 21? Remove it.
In lines 22-28 you check if random number already exist. So you should compare it with existed values. Rewrite "5" in line 22 as "count".
Will it work?

[Myna]

It caused more error when i remove line 21 and when i replaced count with 5 it would cause even more error :(

[swp147]

Disclaimer: I am a beginner.

#include <iostream>
#include <stdlib.h>
#include <time.h>

int main()
{
	// seed the random number generator
	srand(time(NULL));

	// initialize the array of lottery numbers
	int lottery[5];

	std::cout << "Your Lottery:" << std::endl;
	
	// loop until array has no duplicates
	bool unique = false;
	while(!unique) {
		int no_of_duplicates = 0;
		
		// create five random numbers from 1-20 and store them
		for(int i=0; i<5; i++)
			lottery[i] = rand()%20+1;

		// walk through lottery looking for duplicates
		for(int i=0; i<5; i++) {
			for(int ii=0; ii<5; ii++) {
		
				// if there is a duplicate, increase the counter
				if((lottery[ii]==lottery[i]) && (i != ii))
					no_of_duplicates++;
			}
		}
		
		// if there are no duplicates, set unique to true
		// to get out of the while loop
		if(!no_of_duplicates)
			unique = true;
	}

	// display the array
	for(int i = 0; i < 5; i++)
		std::cout << lottery[i] << " ";
		
	return 0;
}