C:将指针转换为整数

Question

我想编写一个方法，它接受两个指向 int 的指针并更改它们指向的值。像这样的东西:

int main() {
    int a = 3;
    int b = 1;
    change(&a, &b);
    return 0;
}

void change(int *a, int *b) {
    int t = a;
    *a = *b;
    *b = *t;
}

我无法理解如何保存 a 的副本并稍后从 b 指向它。

Answer 1

你这样做:

int temp = *a; // remember actual value "a" points to
*a = *b; // copy value "b" points to onto value "a" points to (will overwrite that value, but we have a copy in "temp")
*b = temp; // now copy value "a" originally pointed to onto value "b" points to