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Top Forums UNIX for Dummies Questions & Answers Multiplication using bc in a for loop Post 302375987 by toto on Monday 30th of November 2009 09:49:38 AM
Old 11-30-2009
Quote:
...
I suppose the meaning of scale in bc is the scale to use to carry out the calculation(10 for decimal)
...
No, scale=10 means that the output is formatted with 10 digits after the decimal point.

Excerpt from the manpage of bc:
scale ( expression ) The value of the scale function is the number of digits after the decimal point in the expression.
 

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PROFIL(2)							System Calls Manual							 PROFIL(2)

NAME
profil - execution time profile SYNOPSIS
profil(buff, bufsiz, offset, scale) char *buff; int bufsiz, offset, scale; DESCRIPTION
Buff points to an area of core whose length (in bytes) is given by bufsiz. After this call, the user's program counter (pc) is examined each clock tick (60th second); offset is subtracted from it, and the result multiplied by scale. If the resulting number corresponds to a word inside buff, that word is incremented. The scale is interpreted as an unsigned, fixed-point fraction with binary point at the left: 0177777(8) gives a 1-1 mapping of pc's to words in buff; 077777(8) maps each pair of instruction words together. 02(8) maps all instructions onto the beginning of buff (producing a non-interrupting core clock). Profiling is turned off by giving a scale of 0 or 1. It is rendered ineffective by giving a bufsiz of 0. Profiling is turned off when an exec is executed, but remains on in child and parent both after a fork. Profiling may be turned off if an update in buff would cause a memory fault. SEE ALSO
monitor(3), prof(1) ASSEMBLER
(profil = 44.) sys profil; buff; bufsiz; offset; scale PROFIL(2)
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