Declare Function Atan2 ( ByVal y As Double, ByVal x As Double ) As Double

result = ATan2( y, x )

y
x

The angle whose tangent is y/x, in radians, in the range [-Pi..Pi].

ATan2 returns the arctangent of the ratio y/x as a Double within the range of -Pi to Pi. The arctangent is the inverse of the Tan function. The returned angle is measured in radians (not degrees).

Print Atan2 ( 4, 5 )     'this is the same as PRINT ATN ( 4 / 5 )

The output would be:

0.6747409422235527

• New to FreeBASIC
  
  

• Not available in the -lang qb dialect unless referenced with the alias __Atan2.
  
  

• Tan
  
• Atn
  
• A Brief Introduction To Trigonometry