(off-topic) Searching for variables

You would benefit a lot from learning regular expressions. If you use vim, then it suffices to type ‘*’ when the cursor is over an ‘i’ variable to find all occurrences of ‘i’ as a “word” (so excluding ‘if’ etc.).

Many IDEs go one step farther and allow searching for just the current variable as distinct from other variables & functions of the same name.

Incidentally, I hope that the original poster is joking (as the ‘;-)’ suggests) in the suggestion to use a shared variable for all temporaries. Such sharing makes it harder to modify one use of the variable because one needs to check whether subsequent code is using the resulting value.