代码如下所示：

复制代码 代码如下:

typedef struct st_test

{

int id;

char *pName;

char class[10];

}Student;

void fn(Student *pStud) {

pStud->id = 10;

pStud->pName = "Tom Simith";

strcpy(pStud->class, "Class 1");

printf("sizeof(pStud) = %d /n", sizeof(pStud));// sizeof(pStud) = 4

printf("sizeof(pStud->id) = %d /n", sizeof(pStud->id));// sizeof(pStud->id) = 4

printf("id:%d/n", pStud->id);// id:10

printf("sizeof(pStud->pName) = %d /n", sizeof(pStud->pName));// sizeof(pStud->pName) = 4

printf("strlen(pStud->pName) = %d /n", strlen(pStud->pName));// strlen(pStud->pName) = 10

printf("Name:%s/n", pStud->pName);// Name:Tom Simith

printf("sizeof(pStud->class) = %d /n", sizeof(pStud->class));// sizeof(pStud->class) = 10

printf("strlen(pStud->class) = %d /n", strlen(pStud->class));// strlen(pStud->class) = 7

printf("class:%s/n", pStud->class);// class:Class 1

}

void fnArray(char arr[]) {

printf("arr:%s/n", arr);// arr:Hello

printf("sizeof(arr) = %d /n", sizeof(arr));// sizeof(arr) = 4The length of pointer

printf("strlen(arr) = %d /n", strlen(arr));// strlen(arr) = 5The length of array

}

int main(int argc, char **argv)

{

Student stud;

fn(&stud);

fnArray("Hello");

return 0;

}