跨函数使用内存案例

#include<stdio.h>
#include<malloc.h>
struct student{
     int age;  
};
struct studnet * createStudent();//函数声明，创建学生年龄
void showstudent(struct studnet *);//函数声明,输出学生年龄
int main(){
    strunct student * ps;
    ps = createStudent();
    showstudent(ps);
    return 0;
}
struct studnet * createStudent(){
    struct studnet * p = (struct student *)malloc(sizeof(struct student));
    p->age=19;
    return p;
}
void showstudent(struct studnet *pst){
    printf("%d",pst->age);
}