Why to avoid postfix operator in C++? [duplicate]

Question

I heard a professor saying "Avoid postfix operator where the context allows to choose prefix". I search but I didn't found related posts in stackoverflow that explaining this.

Why to prefer prefix operator++ to postfix operator++ when we have the ability to choose either one?

Answer 1

The prefix operator++ does a single operation -- increment the value.

The postfix operator++ does three operations -- save the current value, increment the value, return the old value.

The prefix version is conceptually simpler, and is always (up to bizarre operator overloads) at least as efficient as the postfix version.