Parameter passing mechanisms in Compiler Design - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to identify the parameter passing mechanism where the actual parameter's value is copied to the formal parameter.

Compiler Design

In [1], changes made to the parameter inside the function do not affect the original argument.

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Acall by reference

Bcall by name

Ccall by value

Dcall by result

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing call by value with call by reference, which allows changes to affect the original.

Call by value means the function receives a copy of the argument's value. Changes inside the function do not affect the original variable.

2fill in blank

medium

Complete the code to identify the parameter passing mechanism where the function can modify the caller's variable directly.

Compiler Design

In [1], the function receives the address of the actual parameter, allowing direct modification.

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Acall by value

Bcall by reference

Ccall by copy-restore

Dcall by name

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up call by reference with call by value, which does not allow changes to the original variable.

Call by reference passes the address of the variable, so the function can change the original variable's value.

3fill in blank

hard

Fix the error in the statement describing call by name parameter passing.

Compiler Design

In call by name, the actual parameter is [1] each time it is used in the function body.

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Are-evaluated

Bpassed as a copy

Cevaluated once at the start

Dpassed by address

Attempts:

3 left

💡 Hint

Common Mistakes

Assuming call by name evaluates the parameter only once like call by value.

In call by name, the actual parameter expression is re-evaluated every time it is accessed inside the function.

4fill in blank

hard

Fill both blanks to complete the description of call by copy-restore mechanism.

Compiler Design

In call by copy-restore, the actual parameter is [1] to the function and [2] back to the caller after the function finishes.

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Acopied

Bpassed by reference

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing copy-restore with call by reference or call by value.

In call by copy-restore, the value is copied into the function at the start and copied back to the original variable after the function ends.

5fill in blank

hard

Fill all three blanks to complete the dictionary comprehension that maps parameter passing mechanisms to their key feature.

Compiler Design

features = { [1]: [2] for [3] in ['call by value', 'call by reference', 'call by name'] }

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Amechanism

B{'call by value': 'copy', 'call by reference': 'address', 'call by name': 're-evaluation'}[mechanism]

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same variable name for keys and values incorrectly.

This dictionary comprehension creates a mapping from each parameter passing mechanism to its main characteristic.