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POGetting Useful Treatment of NaN and Inf by Microsoft C++
 

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  1. POGetting Useful Treatment of NaN and Inf by Microsoft C++
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    <p>Consider the following test program </p> <pre><code>#include &lt;iostream&gt; #include &lt;stdio.h&gt; using namespace std; int main(int argc, char* argv[]) { double a=1,c=0; double i = a/c; // divide by 0 yields infinity double j = a*4.5; double k = c/c; // 0 divide 0 yields NaN FILE * fp = fopen("ttt.txt","wt"); fprintf(fp,"%f\t%f\t%f\t",i,j,k); fclose(fp); double aa,bb,cc; fp = fopen("ttt.txt","rt"); fscanf(fp,"%lf%lf%lf",&amp;aa,&amp;bb,&amp;cc); cout&lt;&lt;aa&lt;&lt;endl&lt;&lt;bb&lt;&lt;endl&lt;&lt;cc&lt;&lt;endl; } </code></pre> <p>when compiled with gcc (any platform that I have tried) creates a file ttt.txt with the contents </p> <p>Inf 4.500000 NaN </p> <p>gives the output <br/></p> <p>Inf<br/> 4.5<br/> NaN<br/></p> <p>No surprises there. Correct behavior under the rules of C99, and things like Matlab</p> <p>Compiling the same program under Microsoft Visual Studio 2008 however gives a file ttt.txt with the contents</p> <p>1.#INF00 4.500000 -1.#IND00 </p> <p>and gives an output of <br/></p> <p>1<br/> -9.25596e+061<br/> -9.25596e+061<br/></p> <p>Such that Microsoft C can not even read it's own representations of Inf and NaN let alone the standard ones, which is utterly useless - any why they would implement it this way is completely beyond me. I know that MSVcc is not completely C99 compliant - BUT Does anyone have any suggestions on how to persuade it to read and write these values, compiler switches, another version of stdio.h, anything.</p> <p>It seems that the only way around this is to implement my own functions to replace fscanf and fprintf but that does seem like re-inventing the wheel. I can't believe I'm the first person to find this annoying - to the point of making Microsoft's stdio library useless, and yet Google is turning up nothing on the subject</p>
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    1. COMaybe this other post may be useful to you: http://stackoverflow.com/questions/7477978/nan-ascii-i-o-with-visual-c
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    2. CO"... why they would implement it this way is completely beyond me." MS C# I/O functions do round-trip floating point (almost) but not MS C++. Hmmmm, it appears MS supports their creation C# better than than C/C++. BTW I just do not see any MS `scanf()` solution.
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