Hey guys, im studying astrophys but i have a programming module, so hopefully this is the right place to ask. I have a few questions that I am having difficulty with so I am going to pose it in the form of a program if that's cool? I can then take it apart to see how its done. I'd appreciate it if someone has the time! So, I need a program that can read in exam results that are in putted (the input is in-between 0 to 100) and it is an unknown number of exam results to be inputted. The program is to look for a repeat number that has been typed in before. So for example the numbers may be inputted for the next 4000 years until the same two come up. So how would I go about the program (maybe using arrays?) that can keep accepting inputs to an unknown quantity. When the matching pair of results are found, I would then like all of the user inputted results to be summed and printed to screen. Any ideas? Thanks in advance!