Find lowest number

[govCode]

I'm having trouble getting my program to display the proper minimum number. It is outputting (-858993460) It is outputting the highest number and average number properly, just not the lowest. I've tried everything I've found on here but I'm missing something. Any help would be appreciated.

const int SIZE = 20;
	int grades[SIZE];
	int count = 0, total = 0;
		
	cout << "Enter up to 20 grades, then enter -1 when finished." << endl;
	cout << endl;

	while (count < SIZE)
	{
		cout << "Enter value #" << count + 1 << ": ";
		cin >> grades[count];

		if (grades[count] != -1)
		{
			total += grades[count];
			count++;
		}
		else
			break;
	}


	int max = grades[0];
	int min = grades[0];

	for (int i = 0; i < SIZE; ++i)
	{
		if (max < grades[i])
		{
			max = grades[i];
		}
		else if (min > grades[i])
		{
			min = grades[i];
		}
	}

	int average = total / count;

	cout << endl;
	cout << "The highest grade is: " << max << endl;
	cout << "The lowest grade is: " << min << endl;
	cout << "The average grade is: " << average << endl;

[JLBorges]

#include <iostream>

int main()
{
    const int SIZE = 20;
    int grades[SIZE];
    int count = 0, total = 0;

    std::cout << "Enter up to 20 grades, then enter -1 when finished.\n\n" ; // << endl;
    // cout << endl;

    const int min_grade = 0 ; // *** added
    const int max_grade = 100 ; // *** added

    while (count < SIZE)
    {
        std::cout << "Enter value #" << count + 1 << ": ";
        std::cin >> grades[count];

        // if (grades[count] != -1)
        if( grades[count] == -1 ) break ;

        if( grades[count] >= min_grade && grades[count] <= max_grade ) // *** added
        {
            total += grades[count];
            count++;
        }
        else std::cout << "invalid grade. please enter a value in [" << min_grade << ',' << max_grade << "]\n" ;
            // break;
    }


    int max = grades[0];
    int min = grades[0];

    for (int i = 0; i < /*SIZE*/ count; ++i)
    {
        if (max < grades[i])
        {
            max = grades[i];
        }
        else if (min > grades[i])
        {
            min = grades[i];
        }
    }

    if( count > 0 ) // *** added
    {
        // int average = total / count;
        const double average = double(total) / count ; // avoid integer division

        // cout << endl;
        std::cout << "\nThe highest grade is: " << max // << endl;
        /*cout*/  << "\nThe lowest grade is: " << min // << endl;
        /*cout*/  << "\nThe average grade is: " << average << '\n' ; // << endl;
    }

}

[govCode]

Thanks a lot! I understand it a lot better now.