On Sat, Nov 25, 2000 at 18:36:56 +0100, Viktor Rosenfeld wrote: > This is the output I get by gcc: > > 18:29 [EMAIL PROTECTED]:~/Projekte/c/2 $ gcc -o test test.c > /tmp/ccc01936: In function `main': > /tmp/ccc01936(.text+0x17): undefined reference to `sqrt' > /tmp/ccc01936(.text+0x2e): undefined reference to `sqrt' > 18:30 [EMAIL PROTECTED]:~/Projekte/c/2 $
Add "-lm" to that line. > When I looked into /usr/include/math.h there was no definition of > sqrt(). <math.h> is the proper file to include for sqrt(). Internally, it includes other header files, including the one that has the sqrt() prototype, but as a user of the C library, you should not care about that. > But I can't find any libm in dselect. The library defining the math functions, libm, is a part of the libc6 package. > Anybody who can help me, getting sqrt() to work? Or is my code incorrect? Your code looks fine, but your command line doesn't. Including the header defining a prototype for a function is a different thing from linking your object files against the library implementing that function. This distinction is often hidden in other environments. HTH, Ray -- Obsig: developing a new sig
