On Tue, Feb 22, 2011 at 3:54 AM, Kai Tietz <ktiet...@googlemail.com> wrote:
> 2011/2/22 Jim Michaels <jmich...@yahoo.com>:
>> #include <tr1/stdint.h>
>> #include <stdio.h>
>> int main(void) {
>> int64_t n1=1300000000000LL;
>> int64_t n2=1999888999256LL;
>> double
>> dnum=n1,
>> dden=n2,
>> dpercent=n1;
>> long double
>> ldnum=n1,
>> ldden=n2,
>> ldpercent=n1;
>>
>> dpercent/=dden;
>> dpercent*=100;
>>
>> ldpercent/=ldden;
>> ldpercent*=100;
>>
>>
>> printf("n1=%I64d, n2=%I64d\n", n1, n2);
>> printf("dnum=%g, dden=%g, dpercent=%4.2f", dnum, dden, dpercent);
>> //printf("ldnum=%Lg, ldden=%Lg, ldpercent=%4.2Lf\n", ldnum, ldden,
>> ldpercent);//this gives error on the L
>> printf("ldnum=%lg, ldden=%lg, ldpercent=%4.2lf\n", ldnum, ldden,
>> ldpercent);
>> //%Lf is a microsoft format and is preferred over %lf for stability.
>> //should display percentages with 3 places to left, and 2 places to
>> right of decimal point.
>> return 0;
>> }
>>
>> /*
>> mingw-test-printf-lf.cpp: In function 'int main()':
>> mingw-test-printf-lf.cpp:25:79: warning: format '%lg' expects type 'double',
>> but argument 2 has type 'long double'
>> mingw-test-printf-lf.cpp:25:79: warning: format '%lg' expects type 'double',
>> but argument 3 has type 'long double'
>> mingw-test-printf-lf.cpp:25:79: warning: format '%4.2lf' expects type
>> 'double', but argument 4 has type 'long double'
>>
>> so... how to you display a long double in printf????
>>
>> */
>
> Hello,
>
> msvcrt's printf/scanf routines don't support 80-bit 'long double'
> printing. We introduced for this ISO-C POSIX compatible printf/scanf
> routines - wide-character ISO -C printf and ISO-C ascii+wide-character
> scanf rountines are just available on mingw-w64's trunk runtime.
> You have here two different ways to solve this. You can call directly
> the ISO-C printf routines by prefixing the printf/scanf routine by
> __mingw_<fct>.
> Other way here is to define before including "stdio.h/wchar.h" headers
> the macro __USE_MINGW_ANSI_STDIO with value one. If you are using C++
> (this is caused by libstdc++ header, which are undefining
> macro-replacement of those functions) you need to include here at the
> end of include block the mingw-w64 specific header _mingw_print_pop.h
> header. This should work too.
>
> I hope it helps,
> Kai
When you get Kai's suggestion to work, would you mind adding this as a
FAQ in the wiki?
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