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 UWA week 34 (2nd semester, week 5) ↓
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The project doesn't require you to print out any explanation of how your project is working - in fact only the last line of output is considered during marking. However, you'll invariably want to print some 'debug' output while developing your project and, at times, may simply wish to "turn it all off" when there's too much of it. In today's Workshop-5 I quickly showed a technique that I use to turn debug printing on and off, without having to edit and re-compile code, or without adding new command-line arguments. The technique involves setting an environment-variable before running your project if you want debug output, or leaving it unset to omit debug printing. Near the top of your source-code, define a global variable:
#include <stdbool.h>
#include <stdlib.h>

bool debug = false;
Then, in main() set the Boolean variable if a specific environment-variable is set:
    debug = getenv("DEBUG");
In any function requiring debug printing, you should now add:
    if(debug) {
        printf("here we are!\n");
    }
Finally, when running your project from the shell, set the environment-variable with:
    prompt>  DEBUG=y ./estimatecron aug crontab-file estimates-file
or omit the DEBUG=y if you don't want to see any debug printing. Good luck,

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