Returns the square root of the argument.
SQR         (argument)
             └──┬───┘ 
       Numeric expression
*The parenthesis enclosing the argument can be omitted when the argument is a numeric value of variable.
SQR(4)
argument: Numeric expression in the range of 0 ≦ argument
Returns the square root of the argument.
10  FOR I=0 TO 10
20  PRINT "SQR"; I; SQR I
30  NEXT I
40  END
Displays the square roots of values from 0 through 10.