How do I code a simple integer circular buffer in C/C++?

Question

I see a lot of templates and complicated data structures for implementing a circular buffer.

How do I code a simple integer circular buffer for 5 numbers?

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Answer 1

If the size and data type of your buffer are fixed, a simple array is all you need:

 int buffer[5];

Add to that a couple pointers:

 int* start = &buffer[0];
 int* end   = &buffer[4]+1;
 int* input = start;
 int* output = start;