[Solved] Identify the error in this operator overloading code:struct Box { var size: Int static func + (lhs: Box, rhs: Box) -> Int { return lhs.size + rhs.size } } | Swift

Swift - Operators and Expressions

Identify the error in this operator overloading code:

struct Box {
    var size: Int
    static func + (lhs: Box, rhs: Box) -> Int {
        return lhs.size + rhs.size
    }
}

AReturn type should be Box, not Int

BOperator + cannot be overloaded for structs

CParameters should be inout

DMissing mutating keyword

Step-by-Step Solution

Solution:

Step 1: Check operator + return type
Operator + usually returns the same type as operands to allow chaining.
Step 2: Identify mismatch
Here it returns Int instead of Box, which breaks expected usage.
Final Answer:
Return type should be Box, not Int -> Option A
Quick Check:
Operator + return type = same as struct [OK]

Quick Trick: Operator + should return the struct type for chaining [OK]

Common Mistakes:

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