have varibles in place of line draw points

[LittleRy]

this is the code i got. and my problem is half way down, but other wise it works, if i take out the, draw.line, line
sorry to bug you guys a again.
____________________________________
var slope : real
var x : real
var b : real

var x1 :real
var y1 : real

var x2 : real
var y2 : real

var x3 : real
var y3 : real

put "make a line"
put "enter x and y cordnates for two points"
loop
var reply1 : string (1)
var reply2 : string (1)
put "what is X1?"
get x1
put "what is Y1?"
get y1
put "what is X2?"
get x2
put "what is Y2?"
get y2
slope:=y2-y1/x2-x1
b:=(slope*x1)-y1
put "the equation is y=",slope,"x+",b
Draw.Line(x1,y1,x1,x2,2) <--------------it will not let me put in the varibles for the points needed for the line, what am i doing wrong?
loop
put "test if point is on the line"
put "what is the X value?"
get x3
put "what is the Y value?"
get y3
%test
if y3=slope*x3+b then
put "yes the point ",x3,",",y3," is on the line y=",slope,"x+",b
else
put "no the point ",x3,",",y3," is not on the line y=",slope,"x+",b
end if
end loop
end loop

[Tony]

check out Draw.Line. You're using the wrong variable type.

[Kharybdis]

Your problem is that you're trying to specify a coordinate that's a real number...

That just won't work in turing. It has to be whole numbers.

Thus, your variables should all be declared integers (or strings if you want to error trap), instead of reals.

[LittleRy]

ok thanks guys