Fellas, why is this happening, especially sometimes but not other times?

Here, I run the program three times, getting the exact same correct output. On the fourth, it outputs broken numbers. The function prnStats what’s being executed.

  • nachtigall@feddit.de
    3·
    2 years ago

    In prnStats() you do not initialise all values. The following snippet only initialises Calories = 0, the rest remains uninitialised.

     float C,F,P,L,Calories = 0;
// is the same as
float C;
float F;
float P;
float L;
float Calories = 0;

    Try this instead:

     float C,F,P,L,Calories;
C = F = P = L = Calories = 0.0;

    I can’t recommend -fanalyzer option enough for finding this kind of mistakes :)

    • lofenyyOP
      2·
      2 years ago

      Awesome, thank you so much!

      How do you use fanalyzer? I’m passing it as a build option in GCC, assuming that it’ll alert me of any issues on either compile or runtime.

      • nachtigall@feddit.de
        2·
        2 years ago

        Exactly! just pass it as an argument to GCC and it will perform static analysis of the code at compile time. For example, with the code you provided, the output looks like this.

        • lofenyyOP
          2·
          2 years ago

          Wow that’s cool. I had no idea GCC did stuff like this.