CMSC $430$ Project $3$

The third project involves modifying the attached interpreter so that it interprets programs for the

complete language.

When the program is run on the command line, the parameters to the function should be supplied

as command line arguments. For example, for the following function header of a program in the

file text.txt:

function main $x$ : integer, $y$ : integer returns character;

One would execute the program as follows:

$$./$compile$$ test.txt $10-10$

In this case, the parameter $x$ would be initialized to $10$ and the parameter $y$ to $-10.$ An example

of a program execution is shown below:

$$\frac{.}{?}$ compile $$ test.txt $10-10$

$//$ Determines the quadrant of a point on the $x-y$ plane

function main $x$ : integer, $y$ : integer returns character;

begin

if $x>0$ then

if $y>0$ then

$\text{'}1\text{'}$;

elsif $y<mn\; id="EditorElement\_1345097">0</mn>$ then

$\text{'}4\text{'}$;

else

$\text{'}\text{'}\text{'}$;

endif;

elsif $x<mn\; id="EditorElement\_1345044">0</mn>$ then

if $y>0$ then

$\text{'}3\text{'}$;

elsif $y<mn\; id="EditorElement\_1344988">0</mn>$ then

$\text{'}2\text{'}$;

else

$\text{'}Y\text{'}$;

endif;

else

if then

$\text{'}x\text{'}$;

else

$\text{'}$O$\text{'}$;

endif;

endif;

end;

Compiled Successfully

Result $=52$