Working of Editor and debugger:

Editor/Debugger, or commands can be typed from Command Window. For illustration, the dbstop command below will set a breakpoint in the fifth line of this function (that is the action of the if clause), that allows us to type the variable names and/or expressions to examine their values at that point in the execution. The dbcont function can be used to carry on the execution, and dbquit is used to quit the debug mode.

Note that the prompt becomes K>> in the debug mode.

>> dbstop testifelse 5

>> testifelse(-2)

5 disp('In middle of range')

K>> x

x =

   -2

K>> 3 < x

ans =

   0

K>> 3 < x < 6

ans =

   1

K>> dbcont

In middle of range

end

>> 

By typing the expressions 3 < x and then 3 < x < 6, we can conclude that the expression 3 < x will return either 0 or 1. Both 0 & 1 are less than 6, therefore the expression will always be true, despite of the value of x!