Conditional statement

[Halsy]

How to give conditional statement if distance is in multiple of 50 then do this and not in multiple of 50 then do this

[Emmanuel Delay]

With (rem) , the remainder of a division.  If the remainder =0, then it's a multiple

 

(if (= 0  (rem (getdist "\nMeasute a distance: ") 50.0))
  (princ "\nIs a multiple of 50")
  (princ "\nIs not a multiple of 50")
)

 

[Halsy]

Thanks Emmanuel Delay