Absolutely stumped with running sum problem.

[jaja009]

I've been at this for hours, and cant seem to get a grasp on what I should use here. The problem is that I have to add the numbers from 100 counting down, to equal 5005. For example 100+99+98+97 and so on. This problem is probably a lot easier to do than I'm making it out to be.

I tried a do while loop, and several others, but I just dont know which loop to use. Here's my sorry excuse of a program, and if I could just get hints as to what I should use, that'll be appreciated. I want to still try to figure it out, so I'll learn:

#include <stdio.h>

int main(void)
{
int sum = 0;
int i = 100;

do
{
sum = sum + i;
i = i - 1;
}
while(sum < 5005);
printf("%d  %d, ", i, sum);

}

Lol, you can see how stumped I was. XD Its supposed to print "100+99+98,...... equal 5005" listing all the integers counting down from 100.

[Adak]

Put your print sum line of code, inside the do while loop.

[Alexander jack]

For loop is compatible for this
Try this ,

for ( ; sum <= 5005 ; sum =sum+i , i=i-1 )
{
printf("%d  %d, \n", i, sum);


}

[jaja009]

Damn, it really WAS simple. XD I basically had the right ideas, just didnt work with the right loop functions. And here I thought I was good at FOR. XD