10-12-2012
Quote:
Originally Posted by
sdosanjh
how do i subtract the variable values listed like below.
Quote:
Originally Posted by
sdosanjh
@elixir,
main requirement is: i have two files File A and File B
There is a big difference between how you handle files and variables. You mention variables in one post (and in the thread title) and files in the other.
Please don't try to oversimplify the problem. This makes it difficult to provide a proper solution.
This User Gave Thanks to elixir_sinari For This Post:
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fixsub(3alleg4) Allegro manual fixsub(3alleg4)
NAME
fixsub - Safe function to subtract fixed point numbers clamping underflow. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
fixed fixsub(fixed x, fixed y);
DESCRIPTION
Although fixed point numbers can be subtracted with the normal '-' integer operator, that doesn't provide any protection against overflow.
If overflow is a problem, you should use this function instead. It is slower than using integer operators, but if an overflow occurs it
will set `errno' and clamp the result, rather than just letting it wrap. Example:
fixed result;
/* This will put 4965 into `result'. */
result = fixsub(itofix(5000), itofix(35));
/* Sets `errno' and puts -32768 into `result'. */
result = fixsub(itofix(-31000), itofix(3000));
ASSERT(!errno); /* This will fail. */
RETURN VALUE
Returns the clamped result of subtracting `y' from `x', setting `errno' to ERANGE if there was an overflow.
SEE ALSO
fixadd(3alleg4), fixmul(3alleg4), fixdiv(3alleg4)
Allegro version 4.4.2 fixsub(3alleg4)