我想在Class（Fraction *）返回一个变量Result

Question

- (Fraction *)add:(Fraction *)addFra {

    Fraction *numerator1 = [[Fraction alloc]initWithFraction:[self initWithNumerator:self.num]];

    Fraction *numerator2 = [[Fraction alloc]initWithFraction:[self initWithNumerator:addFra.num]];

    Fraction *denominator1 = [[Fraction alloc]initWithFraction:[self initWithDenominator:self.den]];

    Fraction *denominator2 = [[Fraction alloc]initWithFraction:[self initWithDenominator:addFra.den]];

    Fraction *result = (numerator1 * denominator2) + (numerator2 * denominator1);

    return result;
}

Answer 1

Objective-C没有运算符重载，所以这些数学运算必须使用方法实现：

Fraction *result = [[numerator1 multiply:denominator2] add:[numerator2 multiply:denominator1]];

我还没有展示multiply:或add:的实施情况，因为坦率地说，我无法理解如何正确地做到这一点。