c - 将多个值返回给多个变量

Question

是否可以从函数返回多个值并将它们分配给多个变量？

假设我有生成 3 个数字的代码

int first, second , third
int generator (a,b,c){
int one , two ,three
//code that generates numbers and assign them into one, two three
}

我想将 int one 的值分配给变量第一个，将两个值分配给第二个变量，将三个值分配给第三个变量。使用 C 语言可以实现类似的功能吗？

Answer 1

您可以传递要为其赋值的变量的地址:

int generator(int* first, int* second, int* third) {
    int one, two, three;

    /* Initialize local variables here. */

    *first = one;
    *second = two;
    *third = three;

    return something;
}

int main(void) {
    int first, second, third;
    generator(&first, &second, &third);
}

另一种方法是创建一个struct并返回该struct:

struct data {
    int one, two, three;
};

并返回:

struct data generator() {
    int one, two, three;

     /* Initialize local variables here. */

    return (struct data) { one, two, three };
}

或者通过函数参数填写¹，与第一种方法类似:

void generator(struct data* d) {
    int one, two, three;

    /* Fill one, two, and three here. */

    d->one = one;
    d->two = two;
    d->three = three;
}

<小时/>

_{¹ 由 @CraigEstey 在此答案的评论中提议}