Hello
In fact you just need to include the file math.h in your source code.
If you have created your project from a stationery, the paths to the include file should be set up
correctly and you should be able to compile your file,
Anyway including the .h file will make sure the compiler calls the function the appropriate way,
but will not add the math code to the application you have to add the appropriate library file to your project.
CrasyCat