Archived

This topic is now archived and is closed to further replies.

DmGoober

sscanf failing on MS's sample code!

Recommended Posts

DmGoober    136
Microsoft uses the following code to demonstrate sscanf: char tokenstring[] = "15 12 14..."; char s[81]; char c; int i; float fp; /* Input various data from tokenstring: */ sscanf( tokenstring, "%s", s ); sscanf( tokenstring, "%c", &c ); sscanf( tokenstring, "%d", &i ); sscanf( tokenstring, "%f", &fp ); /* Output the data read */ printf( "String = %s\n", s ); printf( "Character = %c\n", c ); printf( "Integer: = %d\n", i ); printf( "Real: = %f\n", fp ); However, upon reaching the line where sscanf tries to separate a float, I get the following error: Debug Error! Program G:\CONVERT\DEBUG\CONVERT.EXE runtime error (Press Retry to Debug the App) Pressing retry does nothing, as MSVC++ simple dumps the assembly of SSCANF. I have tried messing around with the code -- the weird thing is that it works sometimes. Floats seem to make the program choke maybe 3/4 of the times I run it. Any hints? Thanks.

Share this post


Link to post
Share on other sites
DmGoober    136
Solved the problem. Here was the actual problem code:

float monkey;
sscanf ("1.5", "%f", &monkey);

Because the Visual C++ does not know what sscanf is really doing (sscanf''s behavior is determined by the format specifiers) vc++ did not know that floating point numbers were being used. Therefore, as an optimization, it did not load floating pt libraries!

Duh!

So the solution is to add this:
float monkey = 10.0;
monkey = 0.0;
sscanf ("1.5", "%f", &monkey);

Fun huh? Nothing like a bit of extra worthless code to make the compiler work correctly, huh?

DmGoober

Share this post


Link to post
Share on other sites