M_PI flagged as undeclared identifier

Question

When I compile the code below, I got these error messages:

(Error  1   error C2065: \'M_PI\' : undeclared identifier 
2   IntelliSense: identifier \"M_PI\"          


        

Answer 1

I used C99 in NetBeans with remote linux host with its build tools.
Try adding #define _GNU_SOURCE and add the -lm during linking.