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Supported in Just BASIC Supported in Liberty BASIC Not supported in Liberty BASIC 5 Not supported in Run BASIC


This function returns the arc tangent of the given number or expression.
The result is expressed in radians.
The opposite is the TAN() function.


  1. ATN(Number)


Most mathematical operations in Just BASIC can be performed on Literal Numbers, Numeric Variables, or Numeric Expressions that consist of Literal Numbers, Numeric Variables, or both.
There are 2 * pi radians in a full circle of 360 degrees. A formula to convert degrees to radians is: radians = degrees divided by 57.29577951.
Some helpful functions to convert between radians and degrees are available at the ACS() function and ASN() function pages.


Print ATN(1)
Print ATN(0.5)
Print ATN(-0.2)
Print ATN(-1/2)

Useful Procedures

' Place a useful function or sub using this keyword here

There is very useful function named atan2(y,x) function, which has its own page.