CIRCLE Starting Angle of -0 Does Not Draw Line from Center (21947)

SUMMARY

In SCREEN 1 or 2 (or a higher graphics mode such as SCREEN 8), a CIRCLE statement with a start or end angle value of negative zero (-0) does not generate a line from the circle edge to the center in QuickBasic Versions 2.00, 2.01, 3.00, 4.00, 4.00b, and 4.50, Microsoft Basic Compiler Versions 6.00 and 6.00b for MS-DOS, and Microsoft Basic PDS Version 7.00. It does generate the line in BasicA or GW-Basic Version 3.20.

The following is an example:

   10 SCREEN 1
   20 X=0
   25 REM  Radius=100, -x=start angle, 1=end angle:
   30 CIRCLE (160,100),100,,-X,1
				

A workaround is to use x=.00001 instead of x=0 in the above program, as follows:

   10 SCREEN 1
   20 X=.00001
   30 CIRCLE (160,100),100,,-X,1
				

Microsoft considers this to be an acceptable difference between the QuickBasic Compiler and the Basic interpreters.