Thread: Any clever construct for a foreach loop in C?

I have some code where I want to do a for loop, iterating over a fixed set of integers. Unfortunately, the set isn't in any incrementalable order - e.g., it's something like

Code:

{ 10, 14, 23, 25 }

These numbers are known at the time I'm writing the code.

I can think of various ways of simulating a "foreach loop" (like perl, etc. have) - put them in an array and do a for loop by index, a linked list, etc.

I'm just wondering if there is some clever construct that I'm overlooking to do a for() loop that isn't limited to number sets that are neatly incremental.

Originally Posted by monk64

I have some code where I want to do a for loop, iterating over a fixed set of integers. Unfortunately, the set isn't in any incrementalable order - e.g., it's something like

Code:

{ 10, 14, 23, 25 }

These numbers are known at the time I'm writing the code.

I can think of various ways of simulating a "foreach loop" (like perl, etc. have) - put them in an array and do a for loop by index, a linked list, etc.

I'm just wondering if there is some clever construct that I'm overlooking to do a for() loop that isn't limited to number sets that are neatly incremental.

Just put it in an array and iterator over the indices.

You say that the data is known, where is the data located? If it's on a file you can do something like this:

Code:

        while( fscanf(fp, "%d", &in) != EOF ){
                //do something
        }

Otherwise, an array is probably the best way to store your numbers.

There is no clever way of doing this, the best path is what you have already thought of by using an array and loop by index. Not to skew too much but the Linux scheduler works very much like this using run time/ wait queues(FIFO) methodology for single proc systems.