Swift:
处理复数

struct ComplexNumber {
    var real: Double
    var imaginary: Double
    
    func add(_ other: ComplexNumber) -> ComplexNumber {
        return ComplexNumber(real: real + other.real, imaginary: imaginary + other.imaginary)
    }
    
    // 其他方法如减法、乘法等
}

let first = ComplexNumber(real: 2, imaginary: 3)
let second = ComplexNumber(real: 1, imaginary: 4)
let result = first.add(second)
print("结果：\(result.real) + \(result.imaginary)i")
// 示例输出：结果：3.0 + 7.0i