interpreter_2002's Introduction

Interpreter 2002

Interpreter 2002 is a program that acts as an interpreter for a simple programming language called 2002. This interpreter accepts and executes the commands, each of which is given on a separate line. The following are the lists of commands the user can implement:

Command	Description
set [var] [val]	Sets the variable [var] to [val]. [val] is written as an integer inclusively between 0 and 2002.
add [var1] [var2]	Stores [var1] + [var2] in [var1]. If the result of the addition is more than 2002, it is truncated to 2002.
sub [var1] [var2]	Stores [var1] - [var2] in [var1]. If the result of the subtraction is less than 0, it is truncated to 0.
mul [var1] [var2]	Stores [var1] * [var2] in [var1]. If the result of the multiplication is more than 2002, it is truncated to 2002.
div [var1] [var2]	Stores [var1] / [var2] in [var1]. If the result of the division is not an integer, it is truncated to the nearest lower integer.
print [var]	Prints the value of [var]. The format is “[var] = [val]”.
goto [lines] [var1] [var2]	Go back the line number [lines] if [var1] < [var2]. The interpreter should automatically continue executing the commands as necessary. The execution will get past this point only if the goto command is re-executed while [var1] ≥ [var2].
exit	Exits the interpreter.

Some charachteristics of the Interpreter 2002:

It accepts only integers between 0 to 2002.
Any undeclared variable is automatically declared with the initial value of 0 whenever it is referred.
Traditionally, an interpreter executes commands one by one, providing immediate feedback. However, since this is a primitive interpreter, it reads the whole program before starting any execution.