I would consider myself fairly proficient in C and have been coding in it extensively for a few years now, but during a tutoring session with another student I got stumped on a problem. We are printing Linux device events in one program than trying to read and interpret the data by piping the input of that program into another. I'm hoping I am overlooking something dumb and that you guys can figure it out.

First program's relevant code:

struct input_event event1;
...
// open correct event file and read its values into the input event struct
... 
printf("%d  %zu.%-6zu  %d  =