例如 1. struct student 2. int num; 3. char name[20] 4. char sex 5. int age 6. float score 7. char addr[301 8.}• 例如： 1. struct student 2. {int num; 3. char name[20]; 4. char sex; 5. int age; 6. float score; 7. char addr[30]; 8. };