Write a program that asks the user to enter positive integer values. The program terminates when the user enters a negative value by displaying on the screen the average value and the second distinct maximum of the list of the positive even integers entered by the user.

#include<stdio.h>
#include<conio.h>
void main()
{
	int nb, count = 0, sum = 0, max1 = -1, max2 = -1;
	while (1) {
		printf("Enter an even number: ");
		scanf("%d", &nb);
		// order is important
		if (nb < 0) break;
		if (nb % 2 != 0) continue;

		count++;
		sum += nb;
		if (nb > max1)
		{
			max2 = max1;
			max1 = nb;
		}
		else
			if (nb!=max1 && nb > max2)
			{
				max2 = nb;
			}
	}
	printf("Second maximum=%d\n", max2);
	printf("Average=%.2lf\n", sum*1.0 / count);

	getch();
}



#include<stdio.h>
#include<conio.h>
void main()
{
	int nb, count = 0, sum = 0, max1 = -1, max2 = -1;

	do {
		do {
			printf("Enter a number: ");
			scanf("%d", &nb);
		} while (nb > 0 && nb % 2 != 0);
 
		if (nb >= 0) {
			count++;
			sum += nb;
			if (nb > max1)
			{
				max2 = max1;
				max1 = nb;
			}
			else
				if (nb!=max1 && nb > max2)
				{
					max2 = nb;
				}
		}
	} while (nb>=0);
	printf("Average=%.2lf\n", sum*1.0 / count);
	printf("Second maximum=%d\n", max2);


	getch();
}