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a compiler bug. http://www.robotc.net/forums/viewtopic.php?f=63&t=5031 
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Author:  Guoxy [ Thu Oct 25, 2012 10:25 am ] 
Post subject:  a compiler bug. 
RobotC 3.51 v1 = 1.0 * sin(30.0/180.0*PI90/180.0*PI)* 0 (cos(30.0/180.0*PI90/180.0*PI) * 0) + 0.135*90/180.0*PI; v2 = 1.0 * sin(30.0/180.0*PI90/180.0*PI)* 0  cos(30.0/180.0*PI90/180.0*PI) * 0 + 0.135*90/180.0*PI; The two expressions above should get the same result, but it did not. the result is :v1=0.212(correct) v2=0.212(wrong) 
Author:  MHTS [ Thu Oct 25, 2012 5:30 pm ] 
Post subject:  Re: a compiler bug. 
I don't have time to confirm it but it looks like it may be the same bug as: viewtopic.php?f=63&t=4839 which is already fixed in the beta build. 
Author:  Guoxy [ Fri Oct 26, 2012 3:06 am ]  
Post subject:  Re: a compiler bug.  
Thank you for the response. I think it's the same bug. Found in 3.50, but still exists in 3.51 
Author:  Spiked3 [ Fri Oct 26, 2012 2:34 pm ]  
Post subject:  Re: a compiler bug.  
I am running 3.5.4_1
produces math 91 * 522 / 360 = 50 should be 131ish. edit; actually I can't get any math to work at the moment
math 76 * 522 / 360 = 71 should be 110ish  it is beyond a paren / order of operations thing. 
Author:  tfriez [ Mon Nov 19, 2012 4:26 pm ] 
Post subject:  Re: a compiler bug. 
This has been resolved for 3.54  It was a matter of float/long calculations being truncated to 16 bits and causing really wacky numbers. 
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