PLC Laboratory 10 - Revision history

Beh01: /* Example */

2024-04-17T07:52:43Z

Example

Beh01: /* Virtual Machine Interpreting Arithmetic Expressions */

2024-04-17T07:49:36Z

Virtual Machine Interpreting Arithmetic Expressions

Beh01 at 06:22, 17 April 2024

2024-04-17T06:22:27Z

Beh01: Created page with "== Virtual Machine Interpreting Arithmetic Expressions == In our previous laboratoy ( Laboratory 9), we have generated a stack-based code defining the c..."

2024-04-17T06:21:37Z

Created page with "== Virtual Machine Interpreting Arithmetic Expressions == In our previous laboratoy ( Laboratory 9), we have generated a stack-based code defining the c..."

New page

== Virtual Machine Interpreting Arithmetic Expressions ==

In our previous laboratoy ([[PLC_Laboratory_9 | Laboratory 9]]), we have generated a stack-based code defining the computation for arithmetic expressions.

The target stack-based code consist of following instructions:
* <code>ADD, SUB, MUL, DIV, MOD</code> - it takes two values from the stack, computes the appropriate values, and stores the result on stack. If necessary, integers are automatically casted into floating-point numbers. <code>MOD</code> works only for integers.
* <code>PUSH (I|F) n</code> - it stores the value <code>n</code> on stack. It will be either <code>int</code> or <code>float</code>.
* <code>LOAD a</code> - it loads the value of variable <code>a</code> to the stack.
* <code>SAVE a</code> - it takes the value from the stack and stores in into variable <code>a</code>.
* <code>PRINT (I|F)</code> - it takes a value from stack and '''based on its type''', prints it on output.

== Input specification ==

Input is a '''correct''' program composed from instructions described above.

== Output specification ==

Interprete the instructions from the input and write the result on the standard output.

== Example ==
* Input
<syntaxhighlight lang="csharp" >
PUSH I 15
SAVE b
LOAD b
SAVE a
LOAD a
PRINT I
LOAD a
LOAD b
ADD
PRINT I
LOAD a
LOAD b
MOD
PRINT I
LOAD a
LOAD b
ADD
SAVE c
LOAD c
PRINT F
LOAD c
LOAD a
ADD
PRINT F
LOAD a
SAVE c
LOAD c
PRINT F
LOAD c
PUSH F 1.1
ADD
PRINT F
PUSH I 10
LOAD a
MOD
PRINT I
</syntaxhighlight >

* Output
<syntaxhighlight lang="bash" >

</syntaxhighlight >

== Solution ==

* You can download the solution: [http://linedu.vsb.cz/~beh01/wiki_data/PLC_Lab10_solution.zip PLC_Lab10_solution.zip]

← Older revision		Revision as of 07:52, 17 April 2024
Line 61:		Line 61:
	* Output		* Output
	<syntaxhighlight lang="bash" >		<syntaxhighlight lang="bash" >
−		+	15
		+	30
		+	0
		+	30
		+	45
		+	15
		+	16.1
		+	10
	</syntaxhighlight >		</syntaxhighlight >

@@ Line 7: / Line 7: @@
 * <code>PUSH (I|F) n</code> - it stores the value <code>n</code> on stack. It will be either <code>int</code> or <code>float</code>.
 * <code>LOAD a</code> - it loads the value of variable <code>a</code> to the stack.
-* <code>SAVE a</code> - it takes the value from the stack and stores in into variable <code>a</code>.
+* <code>SAVE (I|F) a</code> - it takes the value from the stack and stores in into variable <code>a</code> of given type.
 * <code>PRINT (I|F)</code> - it takes a value from stack and '''based on its type''', prints it on output.
 == Input specification ==

@@ Line 1: / Line 1: @@
 == Virtual Machine Interpreting Arithmetic Expressions ==
-In our previous laboratoy ([[PLC_Laboratory_9 | Laboratory 9]]), we have generated a stack-based code defining the computation for arithmetic expressions.
+In our previous laboratory  ([[PLC_Laboratory_9 | Laboratory 9]]), we have generated a stack-based code defining the computation for arithmetic expressions.
 The target stack-based code consist of following instructions:
@@ Line 16: / Line 16: @@
 == Output specification ==
-Interprete the instructions from the input and write the result on the standard output.
+Interpret  the instructions from the input and write the result on the standard output.
 == Example ==