以下各项用于定义结构体类型，并定义结构体变量，其中正确的是________。 A: struct student { char num[5]; int score; }; student stu1,stu2; B: struct student{ char num[5]; int score;};struct student stu1 stu2; C: struct student { char num[5]; int score=96; }; struct student stu1,stu2; D: struct student{ char num[5]; int score;};struct student stu1,stu2;

在如下结构体中，不正确的是( )。 A: struct student {char name[10]; float score; }; B: struct stu[5] {char name[10]; float score; }; C: struct student {char name[10]; float score; } stu[5]; D: struct {char name[10]; float score; }stu[5];

值为7的表达式是【 】。 struct st{int n; struct st *next;} struct st a[3]={5,&a [1],7,&a [2],9,NULL}, *p; p=&a[0];

若有下述程序段，则表达式（　）的值为6。 Struct　st {int　n; struct　st　*next; }; struct　st　a[3]={5,&a[1],6,&a[2],9,'0000'},*p=a;

若有以下程序段： struct st { int n; int *m; }; int a=2,b=3,c=5; struct st s[3]=({101,&a},{102,&c},{103,&b}}; main() { struct st *p; p=s; … } 则以下表达式中值为5的是（ ）。

以下选项中,能定义s为合法的结构体变量的是( ). A: typedef struct CLASS{double a;char b[5];}C; B: typedef CLASS{double a;char b[5];}CLASS s; C: struct{double a;char b[10];}s; D: struct CLASS{double a;char b[5];}CLASS s;

下列结构有多少个不饱和度？https://www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/Questions/problems/Images1/struct5.gif

()为正确的用户标识符 A: struct B: 5 C: _f0.6 D: _for

若有以下定义，则对变量student1中“生日”的正确赋值方式是（ ）。struct student{ int num; char name[20], sex; struct { int year, month, day; } birthday;} ; struct student student1; A: student1.birthday.year = 2003;student1.birthday.month = 5;student1.birthday.day = 1; B: year = 2003;month = 5;day = 1; C: birthday.year = 2003;birthday.month = 5;birthday.day = 1; D: student1.year = 2003;student1.month = 5;student1.day = 1;

以下哪个结构被认为是环戊酮的互变异构体http://www2.chemistry.msu.edu/faculty/reusch/VirtTxtJml/Questions/problems/Images2/struct5.gif