🚀 go-pugleaf

In article <204@sdscal.UUCP> keith@sdscal.UUCP (Keith Jones) writes:

>Well, I didn't quite believe it, but I made this test file and sure enough,
>the printf doesn't print out anything that even looks like it approximates
>PI.
>main()
>{
>    float f;
>    char *string = "3.1415926";
>    f = atof( string );
>    printf( "pi = %f\n", f );
>}

The "problem" is that C, in its infinite stupidity about data types, assumes
that all functions return ints, unless you declare otherwise. So the nice
atof() function, which returns a double, is treated in main() like it has
returned an int, which promptly gets converted into a meaningless float value
that is printed.

If you add the declaration:

double atof();

or, even better:

double atof(const char *string);

or include either stdlib.h or math.h, the program will run successfully.


Tom Almy
toma@tekgvs.labs.tek.com
Standard Disclaimers Apply