* Not having to write the variable 3 times (with C not always being
able to detect if they didn't match)
This is indeed a source of errors in C nested loops. Say we have
these macros:
FOR (i, 0, N-1)
FOR (j, 0, i)
...
we are less likely to make some copy paste error like
for (i = 0; i < N; i++)
for (j = 0; j < i; i++)
...
Int he past, I've run into bugs in nested loops, along these lines.
In loop-heavy code, making a macro like the FOR above might not
be a bad idea.
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