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Operating Systems OS X (Apple) A fixed point basic calculator for DASH. Post 303025597 by Corona688 on Tuesday 6th of November 2018 03:08:50 PM
Old 11-06-2018
Quote:
Originally Posted by wisecracker
I wouldn't know where to start for floating point maths in pure 'dash' and I'll stick my neck out and say it cannot be done at all.
I misread your post as dash misbehaving rather than zsh, but anyway - I don't mean the shell has floating point. I mean shell printf could use it as a temporary intermediate to implement %f.
Quote:
I don't use "%f" anywhere, I use "%.f"
potato, potahto. The simplest way to implement %f is the C function calls strtof and sprintf, which would use a floating point intermediate. It'd unprocess the number into a float then immediately process it back into a string using the "%.f" specifier. Less than a line.

Quote:
Done manually...
Code:
Last login: Tue Nov  6 19:05:47 on ttys000
AMIGA:amiga~> cd Desktop/Code/Shell
AMIGA:amiga~/Desktop/Code/Shell> ./calc .000000277 - +.000000092
+0.000000185
AMIGA:amiga~/Desktop/Code/Shell> # Therefore SUM="000000185"
AMIGA:amiga~/Desktop/Code/Shell> FLOAT="000000185"
AMIGA:amiga~/Desktop/Code/Shell> INT=""
AMIGA:amiga~/Desktop/Code/Shell> NUMBER=$(( FLOAT/100 ))
-bash: 000000185: value too great for base (error token is "000000185")
AMIGA:amiga~/Desktop/Code/Shell> dash
AMIGA:\u\w> ./calc .000000277 - +.000000092
+0.000000185
AMIGA:\u\w> # Therefore SUM="000000185"
AMIGA:\u\w> FLOAT="000000185"
AMIGA:\u\w> INT=""
AMIGA:\u\w> NUMBER=$(( FLOAT/100 ))
dash: 6: Illegal number: 000000185
AMIGA:\u\w> exit
AMIGA:amiga~/Desktop/Code/Shell> _

Bazza...
You're taking the path of maximum resistance again. If you leave out the decimal point entirely and assume all numbers are multiplied by 100, addition and subtraction "just work", no zero padding required. Then you use division and modulus to extract the full and fractional parts later.

Last edited by Corona688; 11-06-2018 at 04:15 PM..
 

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wsprintf(3C)						   Standard C Library Functions 					      wsprintf(3C)

NAME
wsprintf - formatted output conversion SYNOPSIS
#include <stdio.h> #include <widec.h> int wsprintf(wchar_t *s, const char *format, /* arg */ ... );); DESCRIPTION
The wsprintf() function outputs a Process Code string ending with a Process Code (wchar_t) null character. It is the user's responsibility to allocate enough space for this wchar_t string. This returns the number of Process Code characters (excluding the null terminator) that have been written. The conversion specifications and behavior of wsprintf() are the same as the regular sprintf(3C) function except that the result is a Process Code string for wsprintf(), and on Extended Unix Code (EUC) character string for sprintf(). RETURN VALUES
Upon successful completion, wsprintf() returns the number of characters printed. Otherwise, a negative value is returned. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------------------------------------+ |ATTRIBUTE TYPE ATTRIBUTE VALUE | |MT-Level MT-Safe | +-----------------------------------------------------------+ SEE ALSO
wsscanf(3C), printf(3C), scanf(3C), sprintf(3C), attributes(5) SunOS 5.11 29 Dec 1996 wsprintf(3C)
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