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Compare execution time in C language

  1. Feb 20, 2010 #1
    1. The problem statement, all variables and given/known data
    I want to compare the execution times for DDA and Bresenham's Line algorithm using a C program. I used the clock_t command; I'm getting the execution time for Bresenham’s algorithm as 0.164835 but 0 for DDA.

    3. The attempt at a solution

    clock_t start,end;
    Bresenham's line algorithm code

    DDA line algorithm code

    Also I'm getting t=0.164835 for both codes separately. Whereas DDA line algorithm should take more time. What is it that I’m doing wrong?
  2. jcsd
  3. Feb 20, 2010 #2


    Staff: Mentor

    Your times aren't granular enough for what you're trying to measure. The basic unit of the clock_t type is seconds, which is way too large for measuring operations that are happening at clock rates in the gigahertz range.
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