指针就是地址，地址就是指针

2

3 Int * p

malloc函数

跨函数使用内存

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#include<stdio.h>
#include<malloc.h>

struct student
{
        int sid**;
        int age;
};

struct student * greatstudent(void)
{

        struct student * p =(struct student *)malloc(sizeof(struct student));
        p->sid = 99;
        p->age = 88;
        return p;
}
void showstudent(struct student *pst)
{
        printf(“%d %d\n**”,pst->age,pst->sid);

}
int main(void)
{
struct student * ps**;
ps =greatstudent();
showstudent(ps);
return 0;
}**