Difference between revisions of "PLC Laboratory 10"
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(Created page with "== Virtual Machine Interpreting Arithmetic Expressions == In our previous laboratoy ( Laboratory 9), we have generated a stack-based code defining the c...") |
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== Virtual Machine Interpreting Arithmetic Expressions == | == Virtual Machine Interpreting Arithmetic Expressions == | ||
| − | In our previous | + | 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: | The target stack-based code consist of following instructions: | ||
| 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>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>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. | + | * <code>PRINT (I|F)</code> - it takes a value from stack and '''based on its type''', prints it on output. |
== Input specification == | == Input specification == | ||
| Line 16: | Line 16: | ||
== Output specification == | == Output specification == | ||
| − | + | Interpret the instructions from the input and write the result on the standard output. | |
== Example == | == Example == | ||
| Line 61: | Line 61: | ||
* Output | * Output | ||
<syntaxhighlight lang="bash" > | <syntaxhighlight lang="bash" > | ||
| − | + | 15 | |
| + | 30 | ||
| + | 0 | ||
| + | 30 | ||
| + | 45 | ||
| + | 15 | ||
| + | 16.1 | ||
| + | 10 | ||
</syntaxhighlight > | </syntaxhighlight > | ||
Latest revision as of 07:52, 17 April 2024
Contents
Virtual Machine Interpreting Arithmetic Expressions
In our previous laboratory ( Laboratory 9), we have generated a stack-based code defining the computation for arithmetic expressions.
The target stack-based code consist of following instructions:
ADD, SUB, MUL, DIV, MOD- 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.MODworks only for integers.PUSH (I|F) n- it stores the valuenon stack. It will be eitherintorfloat.LOAD a- it loads the value of variableato the stack.SAVE (I|F) a- it takes the value from the stack and stores in into variableaof given type.PRINT (I|F)- 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
Interpret the instructions from the input and write the result on the standard output.
Example
- Input
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
- Output
15
30
0
30
45
15
16.1
10
Solution
- You can download the solution: PLC_Lab10_solution.zip
