Why this C code prints different output in different runs?

Question

Shouldn't it just print 5? Cuz it converts int to double and loses the decimal numbers
https://code.sololearn.com/clF1dG346S32/?ref=app

Answer 1

Rishi

Everytime you are getting garbage value because of incompatible type of int and double.

So if you want to print only 5 then use %.f

printf("%.f", a);

Or you have to cast with int:

printf("%d", (int) a);

Answer 2

A͢J but why does it produce a garbage value? What does it do with the a then? Won't it just misinterpret the 'a' and produce some wrong value, but related to a? (So that the output won't change everytime)