sizeof, strlen, 指標和數組作為函數參數

typedef struct st_test<br />{<br />int id;<br />char *pName;<br />char class[10];<br />}Student;</p><p>void fn(Student *pStud) {<br />pStud->id = 10;<br />pStud->pName = "Tom Simith";<br />strcpy(pStud->class, "Class 1");<br />printf("sizeof(pStud) = %d /n", sizeof(pStud));// sizeof(pStud) = 4<br />printf("sizeof(pStud->id) = %d /n", sizeof(pStud->id));// sizeof(pStud->id) = 4<br />printf("id:%d/n", pStud->id);// id:10<br />printf("sizeof(pStud->pName) = %d /n", sizeof(pStud->pName));// sizeof(pStud->pName) = 4<br />printf("strlen(pStud->pName) = %d /n", strlen(pStud->pName));// strlen(pStud->pName) = 10<br />printf("Name:%s/n", pStud->pName);// Name:Tom Simith<br />printf("sizeof(pStud->class) = %d /n", sizeof(pStud->class));// sizeof(pStud->class) = 10<br />printf("strlen(pStud->class) = %d /n", strlen(pStud->class));// strlen(pStud->class) = 7<br />printf("class:%s/n", pStud->class);// class:Class 1<br />}</p><p>void fnArray(char arr[]) {<br />printf("arr:%s/n", arr);// arr:Hello<br />printf("sizeof(arr) = %d /n", sizeof(arr));// sizeof(arr) = 4The length of pointer<br />printf("strlen(arr) = %d /n", strlen(arr));// strlen(arr) = 5The length of array<br />}</p><p>int main(int argc, char **argv)<br />{</p><p>Student stud;<br />fn(&stud);</p><p>fnArray("Hello");<br /> return 0;<br />}