for loop VS while loop in programming languages, c++/java?

Question

Which is better for performance? This may not be consistent with other programming languages, so if they are different, or if you can answer my question with your knowledge in a

Answer 1

It is compiler specific, but I would imagine that in nearly all cases the performance will be the same for both approaches.

To be sure for a specific situation you should measure the performance, although before you spend many hours micro-optimizing code like this you should first be sure that this is in fact the bottleneck in your application (probably it isn't).

Your second example could be writen as a for loop with no initialization expression.

int age = 17; // This was made for something else in the code

for (; age < 25; age++) {
    cout << age << endl;
}