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The programmer needed to create a precise short delay in his program. He discovered that if he did 1,863 multiplies, that would create the correct delay. This fact has been turned into the following subroutine. But in some circumstances, the function fails. Why?
1 /*************************************************
2 * bit_delay -- Delay one bit time for *
3 * serial output. *
4 * *
5 * Note: This function is highly system *
6 * dependent. If you change the *
7 * processor or clock it will go bad. *
8 *************************************************/
9 void bit_delay(void)
10 {
11 int i; // Loop counter
12 int result; // Result of the multiply
13
14 // We know that 1863 multiplies delay
15 // the proper amount
16 for (i = 0; i < 1863; ++i)
17 {
18 result = 12 * 34;
19 }
20 }
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A real comment from one of my first programs.
C------------------------------------------------------------
C This program works just like PLOT10 except it works with
C metric data files (MDF). The reason that I didn't add a new
C format to PLOT10 was that PLOT10 is so convoluted that I
C can't understand it.
C
C I have no idea what the input units are nor do I have any idea
C what the output units are but I do know that if you divide
C by 3 the plots look about the right size.
C------------------------------------------------------------
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