Fix: Calculator Order of Operations (PEMDAS/BODMAS)

[muhammadnoorulainroy]

Fix: Calculator Order of Operations (PEMDAS/BODMAS)

Fixes #134

Problem

The calculator was evaluating expressions sequentially from left to right instead of following standard mathematical order of operations, resulting in incorrect calculations.

Examples:

• 2 + 3 × 4 returned 20 (expected: 14)
• 10 - 8 / 2 returned 1 (expected: 6)
• 12 - 3 / 3 returned 3 (expected: 11)

Solution

Implemented a two-pass algorithm to enforce operator precedence:

1. First pass processes multiplication and division (left to right)
2. Second pass processes addition and subtraction (left to right)

Test Results

All 14 tests passing:

• PEMDAS/BODMAS precedence rules are correctly enforced
• Same-precedence operations are evaluated left-to-right
• No regressions in existing functionality

Screenshots of Working Functionality

[vercel]

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[muhammadnoorulainroy]

@Kanavpreet-Singh, please review.