min_score 질문

int main()
{
	//const int num_students = 5;
	int scores[] = { 84,92,76,81,56 };

	const int num_students = sizeof(scores) / sizeof(int);

	int max_score = 0;
	int min_score = 0;
	int total_score = 0;

	for (int i = 0; i < num_students; i++)
	{
		total_score += scores[i];
		
		//max_score = (max_score < scores[i]) ? scores[i] : max_score;
		
		if (max_score < scores[i])
		{
			max_score = scores[i];
		}

		if (min_score > scores[i])
		{
			min_score = scores[i];
		}
	}

	double avg_score = static_cast<double>(total_score) / num_students;
	cout << max_score << endl;
	cout << min_score << endl;
        
        return 0;
}

여기서 min_score값을 100으로 올리니까 값이 나오는데 
min_score값을 왜 올려야 하는건가요??