In this lab we had to create a calculator that will display a menu asking the user what operation to perform. The operations supported are addition, subtraction, multiplication, exponentiation and convert to roman numerals  . When  the user selects an operation the program will ask the user for the values and perform the operation.

program Calc1;
#include("stdlib.hhf")
static
x:int32;
y:int32;
r:int32;
i:int32;
j:int32;
Operation:int32;

begin Calc1;

repeat

stdout.put("Enter 1 to add numbers: ",nl);

stdout.put("Enter 2 to subtract numbers: ",nl);

stdout.put("Enter 3 to multiply numbers: ",nl);

stdout.put("Enter 4 to convert to roman numbers: ",nl);

stdout.put("Enter 5 to do exponents:",nl);

stdout.put("Enter 0 to exit: ",nl);

stdin.get(Operation);

mov(Operation,edx);

switch(edx)


case(1)
		mov(0,r);
		stdout.put("enter number 1: ");
		stdin.get(x);
		if(x>65536) then
			stdout.put(nl,"number is larger than 65536!" , nl);
		endif;
		stdout.put(nl);
		stdout.put("enter number 2: ");
		stdin.get(y);
		if(y>65536) then
			stdout.put(nl,"number is larger than 65536!" , nl);
		endif;
		stdout.put(nl);
		mov(x,eax);
		mov(y,ebx);
		add(ebx,eax);
		mov(eax,r);
		stdout.put("The answer is: ",r,nl);
		if(r>65536) then
			stdout.put(nl,"number is larger than 65536!" , nl);
		endif;
		stdout.put(nl);

case(2)
		mov(0,r);
		stdout.put("enter number 1: ");
		stdin.get(x);
		if(x>65536) then
			stdout.put(nl,"number is larger than 65536!" , nl);
		endif;
		stdout.put(nl);
		stdout.put("enter number 2: ");
		stdin.get(y);
		if(y>65536) then
			stdout.put(nl,"number is larger than 65536!" , nl);
		endif;
		stdout.put(nl);
		mov(x,eax);
		mov(y,ebx);
		sub(ebx,eax);
		mov(eax,r);
		stdout.put("The answer is: ",r,nl);
		if(r>65536) then
			stdout.put(nl,"number is larger than 65536!" , nl);
		endif;
		stdout.put(nl);

	
case(3)
		mov(0,r);
		stdout.put("enter number 1: ");
		stdin.get(x);
		if(x>65536) then
			stdout.put(nl,"number is larger than 65536!" , nl);
		endif;
		stdout.put(nl);
		stdout.put("enter number 2: ");
		stdin.get(y);
		if(y>65536) then
			stdout.put(nl,"number is larger than 65536!" , nl);
		endif;
		stdout.put(nl);
		mov(x,eax);
		mov(y,ebx);
		while(ebx > 0) do
			add(eax,r);
			sub(1,ebx);
		endwhile;
		stdout.put("the answer is: ",r,nl);
		if(r>65536) then
			stdout.put(nl,"number is larger than 65536!" , nl);
		endif;
		stdout.put(nl);

case(4)
		mov(0,r);
		stdout.put("enter a number: ");

  		stdin.get(x);

		if(x>65536) then
			stdout.put(nl,"number is larger than 65536!" , nl);
		endif;
		stdout.put(nl);
  		mov(x,eax);

  		while(eax > 0) do

  		  if(eax >= 1000 ) then

      			stdout.put("M");

      			sub(1000,eax);

      		  elseif(eax >= 900 ) then

      			stdout.put("CM");

      			sub(900,eax);

      		  elseif(eax >= 500 ) then

      			stdout.put("D");

      			sub(500,eax);


      		  elseif(eax >= 400 ) then

      			stdout.put("CD");

      			sub(400,eax);


      		  elseif(eax >= 100 ) then

              		stdout.put("C");

      			sub(100,eax);

 
      		  elseif(eax >= 90 ) then

      			stdout.put("XC");

      			sub(90,eax);


      		  elseif(eax >= 50 ) then

      			stdout.put("L");

      			sub(50,eax);


      		  elseif(eax >= 40 ) then

      			stdout.put("XL");

      			sub(40,eax);


      		  elseif(eax >= 10 ) then

      			stdout.put("X");

      			sub(10,eax);


      		  elseif(eax >= 9 ) then

      			stdout.put("IX");

      			sub(9,eax);

      		  elseif(eax >= 5 ) then

      			stdout.put("V");

      			sub(5,eax);


      		  elseif(eax >= 4 ) then

      			stdout.put("IV");

      			sub(4,eax);


      		  elseif(eax >= 1 ) then

      			stdout.put("I");

      			sub(1,eax);


      
      endif;

      
  endwhile;


  stdout.put(nl);

case(5)
		mov(0,r);
		stdout.put("enter number 1: ");
		stdin.get(x);
		if(x>65536) then
			stdout.put(nl,"number is larger then 65536!" , nl);
		endif;
		stdout.put(nl);
		stdout.put("enter number 2: ");
		stdin.get(y);
		if(y>65536) then
			stdout.put(nl,"number is larger then 65536!" , nl);
		endif;
		stdout.put(nl);
		mov(x,eax);
		mov(y,ebx);
		mov(1,r);
		for(mov(0,i); i<ebx; inc(i)) do

 		mov(0,ecx);
		for(mov(0,j); j65536) then
			stdout.put(nl,"number is larger then 65536!" , nl);
endif;
		stdout.put(nl);

endswitch;

until(edx = 0);

stdout.put("end program");

end Calc1;