ScopeWalker

A toy C++ program that demonstrates lexical scoping implementation. This interactive REPL lets you create variables and navigate between scope levels to understand how lexical environments work.

Build & Run

clang++ env.cpp -o scope
./scope

Commands

• let <var> = <value> - Declare a variable in the current scope
• <var> - Look up and display a variable's value
• deep - Enter a new nested scope
• shallow - Exit current scope

Example

>> let a = 4
4
>> a
4
>> deep
1: Scope Deep!
>> let b = a
4
>> b
4
>> deep
2: Scope Deep!
>> let c = b
4
>> b
4
>> c
4
>> a
4
>> shallow
Out Of Scope 2
>> c
0
>> b
4
>> a
4
>> let a = a
4
>> a
4
>> b
4
>> shallow
Out Of Scope 1
>> b
0
>> c
0
>> a
4
>>