ATAN2() – Arctangent of the Ratio – FORTRAN

In Fortran, the ATAN2() function can be used to calculate the arctangent of the ratio of two numbers. The ATAN2() function takes two arguments, representing the y-coordinate and x-coordinate, and returns the angle in radians.

Example

program atan2_example
  real :: x, y, result

  x = 1.0
  y = 1.0
  result = ATAN2(y, x)

  write(*,*) "The arctangent of (", y, "/", x, ") is", result

end program atan2_example

Output

 The arctangent of (   1.00000000     /   1.00000000     ) is  0.785398185 

 

We calculate the arctangent of the ratio y/x using ATAN2(y, x).

The result is stored in the variable result and then printed to the console using the write statement.

 

Note:

• Keep in mind that the ATAN2() function returns the angle in radians.
• If you want the result in degrees, you can convert it using program Radian to Degree – FORTRAN