Comparing execution times
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Thread: Comparing execution times

  1. #1
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    Comparing execution times

    Hi, I am working on a program for a school assignment. I am not sure exactly how to code this at all. If anyone could help, that would be very much appreciated. This is the problem:

    1+2+3+...+n=(n(n+1))/2

    Write a C++ program that compares the execution time of the above summation using two different solutions: one that uses loops, and another that uses the closed form approach. Use large values of n for the comparisons, such as, 10^7, 10^8, 10^9, 10^10, 10^11,10^12, 10^13, and 10^14. Provide a comparison table for the execution time in both solutions.Do not worry about the value of the actual sum. Overflow will occur in the sum value rendering it invalid; however, this is not the primary concern of the program. Execution time is the primary concern.


    Thank you for your help

  2. #2
    2kaud's Avatar
    2kaud is offline Super Moderator Power Poster
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    Re: Comparing execution times

    So how far have you got with this assignment and what is your c++ programming question - as writing code to actually produce the sum in the two ways mentioned is fairly trivial? How have you been told to obtain the execution time of a portion of code? If you post the code you have so far we'll provide guidance and advice.

    See http://forums.codeguru.com/showthrea...ork-assignment
    All advice is offered in good faith only. All my code is tested (unless stated explicitly otherwise) with the latest version of Microsoft Visual Studio (using the supported features of the latest standard) and is offered as examples only - not as production quality. I cannot offer advice regarding any other c/c++ compiler/IDE or incompatibilities with VS. You are ultimately responsible for the effects of your programs and the integrity of the machines they run on. Anything I post, code snippets, advice, etc is licensed as Public Domain https://creativecommons.org/publicdomain/zero/1.0/ and can be used without reference or acknowledgement. Also note that I only provide advice and guidance via the forums - and not via private messages!

    C++17 Compiler: Microsoft VS2017 (15.5.0)

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