Iterating over all unsigned integers in a for loop

Question

Let\'s say I want to iterate over all integers in a for loop. For the sake of discussion, assume I am calling some unknown function f(unsigned x) f

Answer 1

You'll have to perform the test at the end of the loop body, much like a do-while:

for (unsigned int i = 0; /* nothing */; i++) {
    ...
    if (i == UINT_MAX) {
        break;
    }
}

For a test in the standard for loop test position to work, you would need to track the current iteration in a way that can distinguish between UINT_MAX+2 states: one for each time you enter the loop body, and one for the one time you don't. A single unsigned int can't handle that, so you'd need at least one auxiliary variable or a bigger loop counter.