#include <stdio.h>

int sumPosInts(int num)
{
    int counter;
    int sum;
    counter = 1;
    sum = 0;
    while(counter <= num) {
        sum = sum + counter;
        counter = counter + 1;
    }
    return sum;
}

void printRevEvens(int num)
{
    int counter;
    counter = num;
    while(counter >= 0) {
        if ((counter % 2) == 0) {
            printf("%d\n",counter);
        }
        counter = counter - 1;
    }
}

void printRevEvens2(int num)
{
    num = (num / 2) * 2;
    while(num >= 0) {
        printf("%d\n",num);
        num = num - 2;
    }
}

void sumPosNums(void) 
{
    int num;
    int sum;
    sum = 0;
    num = 0;
    while (num >= 0) {
         sum = sum + num;
         printf("Enter a positive number, and I'll sum them");
         scanf("%d", &num);
    }
}

int main(void)
{
    int sumOfInts;
    printRevEvens2(5);
    sumOfInts = sumPosInts(5);
    return 0;
}