LLD - Design — Splitwise (Expense Sharing)
Which of the following code snippets correctly sets the initial balance to zero before processing transactions?
Which of the following code snippets correctly sets the initial balance to zero before processing transactions?
easy🧠 Conceptual Q3 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand initialization
To start balance calculation, the balance variable must be explicitly set to zero.Step 2: Analyze options
balance = 0 correctly assigns zero to balance. balance += 0 adds zero to an undefined variable, which may cause error. balance = null assigns null, which is not a numeric zero. balance == 0 is a comparison, not assignment.Final Answer:
balance = 0 -> Option CQuick Check:
Initialization requires assignment, not comparison or addition [OK]
Quick Trick: Use '=' to assign zero, not '==' or '+=' [OK]
Common Mistakes:
MISTAKES- Using '==' instead of '=' for assignment
- Adding zero to an uninitialized variable
- Assigning null instead of zero
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