1#include <stdio. h>
2 int main(){
struct birthday{int year, month, day;};
struct stu{
int num; char *name; float score;
struct birthday b;
} s1={1,"ztg",99,{2000,2,20}};
printf("学号:%d 姓名:%s 生日:%d-%d-%d 成绩:%.1f\n",
s1. num, s1. name, s1. b. year, s1. b. month,
s1. b. day, s1. score);
struct stu *ps=&s1, s[3]={
{8,"tong",100,{2001,2,16}},
{9,"guang",98,{2002,12,11}}};
ps->num=2, ps->name="zhang", ps->score=100;
printf("学号:%d 姓名:%s 生日:%d-%d-%d 成绩:%. lf\n", ps->num, ps->name, ps->b. year, ps->b. month, (*ps). b. day, (*ps). score);
printf("学号:%d 姓名:%s 生日:%d-%d-%d 成绩:%.1f\n", s[1]. num, s[1]. name, s[1]. b. year, s[1]. b. month, s[1]. b. day, s[1]. score);
s[2]=s1;
printf("学号:%d 姓名:%s 生日:%d-%d-%d 成绩:%.1f\n", s[2]. num, s[2]. name, s[2]. b. year, s[2]. b. month, s[2]. b. day, s[2]. score);

#include <stdio.h>
int main(){
struct birthday{int year,month,day;};
struct stu{
int num; char *name; float score;
struct birthday b;
} s1={1,"ztg",99,{2000,2,20}};
printf("学号:%d 姓名:%s 生日：%d-%d-%d 成绩：%.1f\n",
s1.num, s1.name, s1.b.year, s1.b.month,
s1.b.day, s1.score);
struct stu *ps=&s1, s[3]={
{8,"tong",100,{2001,2,16}},
{9,"guang",98,{2002,12,11}}};
ps->num=2, ps->name="zhang", ps->score=100;
printf("学号:%d 姓名:%s 生日:%d-%d-%d 成绩:%.1f\n",
ps->num, ps->name, ps->b.year, ps->b.month,
(*ps).b.day,(*ps).score);
printf("学号:%d 姓名:%s 生日:%d-%d-%d 成绩:%.1f\n",
s[1].num, s[1].name, s[1].b.year, s[1].b.month,
s[1].b.day,s[1].score);
s[2]=s1;
printf("学号:%d 姓名:%s 生日:%d-%d-%d 成绩:%.1f\n",
s[2].num,s[2].name,s[2].b.year, s[2].b.month,
s[2].b.day,s[2].score);
}

#include <stdio.h>
union data{
int i;
char c;
} u;
struct test{
int i;
char c[2];
};
int main(void){
printf("union:%ld struct:%ld\n",
sizeof (union data), sizeof (struct test));
u.i=1;
if(u.c) printf("u.c=%d,小端模式\n",u.c);
}

#include <stdio.h>
#include <stdlib.h>
int main(){
enum color{red=1,green,blue};
enum color c;
printf("1:red, 2:green, 3:blue\n");
printf ("please input:");
scanf ("%u",&c);
switch (c){
case red: printf("red\n"); break;
case green: printf ("green\n"); break;
case blue: printf("blue\n"); break;
default: printf("input wrong\n");
}
}

#include <stdio.h>
#include <stdlib.h>
int main(){
enum color{red=1, green, blue};
enum color c;
printf("1:red, 2:green, 3:blue\n");
printf("please input: ");
scanf ("%u", &c) ;
switch (c){
case 1: printf("red\n"); break;
case 2: printf("green\n"); break;
case 3: printf( "blue\n"); break;
default:printf("input wrong\n");
}
}

#include <stdio.h>
#include <string.h>
typedef struct {
char name[50];
int grade;
} Student;
int main() {
Student student1 = {"liujia", 87};
Student student2 = {"wangkai", 89};
printf("第1行学生数据:\n");
printf("姓名: %s\n", student1.name);
printf("成绩: %d\n", student1.grade);
printf("\n第2行学生数据:\n");
printf("姓名: %s\n", student2.name);
printf("成绩: %d\n", student2.grade);
return 0;
}

#include <stdio.h>
#include <string.h>
typedef struct {
char name[50];
float score;
} Student;
int main() {
Student student1, student2;
printf("请输入第1个学生的姓名：");
scanf("%s", student1.name);
printf("请输入第1个学生的成绩：");
scanf("%f", &student1.score);
printf("请输入第2个学生的姓名：");
scanf("%s", student2.name);
printf("请输入第2个学生的成绩：");
scanf("%f", &student2.score);
if (网页链接 > 网页链接 || (网页链接 == 网页链接 && strcmp(student1.name, student2.name) < 0)) {
printf("成绩较高或相同的学生是：\n");
printf("姓名：%s\n", student1.name);
printf("成绩：%.2f\n", student1.score);
} else {
printf("成绩较高或相同的学生是：\n");
printf("姓名：%s\n", student2.name);
printf("成绩：%.2f\n", student2.score);
}
return 0;
}

哈哈哈，咋这么多作业啊。快五一了，之后在写

链表的应用