Given the following code snippet, which statement correctly allows the function to update the global variable total?

1. total = 0
2. def main() :
3. avg = 0
4. for i in range(6) :
5. iSquared = i * i
6. total = total + iSquared
7. avg = total / i
8. print(total)
9. print(avg)

Question

Given the following code snippet, which statement correctly allows the function to update the global variable total?

1. total = 0
2. def main() :
3.    avg = 0
4.    for i in range(6) :
5.       iSquared = i * i
6.       total = total + iSquared
7.    avg = total / i
8.    print(total)
9.    print(avg)

BlackTom AI · Accepted Answer

The question asks which modification enables the function to update the global variable total while executing the given code snippet.
Option 1: 'move line 1 inside the function definition' would place total = 0 inside the function. However, without declaring total as global inside the function, Python will treat total as a local variable within main, so the assignment total = total + iSquared would refer to a local total that hasn’t been initialized yet, causing an error. Therefore this change does not correctly enable updating the global total.
Option 2: 'line 1 already allows the total variable to be updated' is incorrect because assigning to total inside a function creates/edits a local variable by default. Without a global declaration, the global total remains untouched, so the function cannot update the global total.
Option 3: 'add the keyword global to line 1' suggests placing a global declaration on a line outside of any function. In Python, the global statement must appear inside a function scope to affect names that are assigned within that function. Placing 'global' on line 1 outside a function does not influence the local scope of main, so it will not enable the function to update the global total. Hence this option is not viable.
Option 4: 'add the statement global total after line 2' envisions inserting 'global total' at the start of the function body (after def main():). This is exactly how Python marks total as a global variable within that function, ensuring that assignments to total inside the loop modify the global total rather than creating a new local variable. This aligns with Python's scoping rules and enables the intended update of the global total.

Fal25_CS003C_74229 Ch. 5 Pre-Quiz (Remotely Proctored)

Given the following code snippet, which statement correctly allows the function to update the global variable total? 1. total = 0 2. def main() : 3. avg = 0 4. for i in range(6) : 5. iSquared = i * i 6. total = total + iSquared 7. avg = total / i 8. print(total) 9. print(avg)

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