this is a copy I pasted from another thread to let you know I got the problem
solved.
I found code that resolves my issue and I get
the formatting I want (which what I really want is a quantity of left-hand-side
digits and a qty of right-hand-side digits).
printf("precision=%d, d=%*.*f\n", width, precision, d); //generates forever
loop of spaces, program hangs.
#include <cstdio>//stdio.h
int main(void) {
int lhsNumDigits=9, rhsNumDigits=5, width=lhsNumDigits+rhsNumDigits+1,
precision=rhsNumDigits;
//floats
printf("d=%0*.*f\n", width, precision, 55.292);
//d=000000055.29200
printf("d=%*.*f\n", width, precision, 55.292);
//d= 55.29200
//strings too.
printf("d=%*s\n", 5, "abc");
//d= abc
printf("d=%*s\n", 5, "abcdefghi");
//d=abcdefghi
return 0;
}
thanks folks. problem resolved.
>________________________________
> From: K. Frank <kfrank2...@gmail.com>
>To: mingw64 <mingw-w64-public@lists.sourceforge.net>
>Sent: Friday, May 9, 2014 5:00 PM
>Subject: Re: [Mingw-w64-public] printf("%*.*f",d) broken?
>
>
>Hi Jim!
>
>On Fri, May 9, 2014 at 5:29 PM, Jim Michaels <j...@yoohoo.com> wrote:
>> I could not find a good example on this because examples in books are scarce
>> as hen's teeth. search engines ignore the * character and maybe even
>> interpret it like a wildcard. :-/ so examples on the web are out.
>>
>> #include <stdio.h>
>> int main(void) {
>> double d=1234567890.123456789;
>> int width=7,precision=3;//tried 3 and 9
>> printf("width=%d, precision=%d, d=%*.*f\n", width, precision, d);
>> //generates forever loop of spaces, program hangs.
>> return 0;
>> }
>
>I think that you have too few arguments to your printf call.
>
>I don't actually know what "%*.*f" does, but I assume it uses printf
>arguments to specify the actual format. But (according to my
>assumption) "width=%d, precision=%d" has already used up the
>arguments that "%*.*f" is expecting.
>
>When I change the line
>
> printf("width=%d, precision=%d, d=%*.*f\n", width, precision, d);
>
>to
>
> printf("width=%d, precision=%d, d=%*.*f\n", width, precision,
>width, precision, d);
>
>the program works as I would expect, printing out
>
> width=7, precision=3, d=1234567890.123
>
>
>> I need to use this. but it seems broken. it just locks up generating spaces
>> no matter what I put in for numbers. I don't think that's right.
>>
>> Jim Michaels
>> ...
>
>
>Good luck.
>
>
>K. Frank
>
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