Is there a performance difference between i++ and ++i in C++?

Question

We have the question is there a performance difference between i++ and ++i in C?

What\'s the answer for C++?

Answer 1

++i is faster than i++ because it doesn't return an old copy of the value.

It's also more intuitive:

x = i++;  // x contains the old value of i
y = ++i;  // y contains the new value of i 

This C example prints "02" instead of the "12" you might expect:

#include 

int main(){
    int a = 0;
    printf("%d", a++);
    printf("%d", ++a);
    return 0;
}

Same for C++:

#include 
using namespace std;

int main(){
    int a = 0;
    cout << a++;
    cout << ++a;
    return 0;
}