程序代码：

#include<stdio.h>
struct point{
    int x;
    int y;
};

struct point* getStrcut(struct point*);
void output(struct point);
void print(const struct point *p);

int main(int argc,char const *argv[])
{
    struct point y={0,0};
    getStruct(&y);
    output(y);
    output(*getStruct(&y));
    print(getStruct(&y));
    getStruct(&y)->x = 0;
    *getStruct(&y) = (struct point){1,2};
}

struct point* getStruct(struct point *p)
{
    scanf("%d",&p->x);
    scanf("%d",&p->y);
    printf("%d,%d",p->x,p->y);
    return p;
}

void output(struct point p)
{
    printf("%d,%d",p.x,p.y);
}

void print(const struct point *p)
{
    printf("%d,%d",p->x,p->y);
}