11 结构体

5.通讯录排序：建立一个通讯录，通信录的结构记录包括：姓名，生日，电话号码；其中又包括三项：年，月，日。编写程序，定义一个嵌套的结构类型，输入n个联系人的信息，再按他们的年龄从小到大的顺序依此输出其信息。试编写相应程序。

#include<stdio.h>
#include<string.h>
void order(struct student students[10],int n);
struct birthday{
int year;
int month;
int day;
};
struct student{
char name[10];
struct birthday bd;
int num;
};
int main(void)
{
int i,n;
printf("输入联系人个数:");
scanf("%d",&n);
struct student students[10];
for(i=0;i<n;i++){
printf("name:");
scanf("%s",&students[i].name);
printf("num:");
scanf("%d",&students[i].num);
printf("birthday:");
scanf("%d%d%d",&students[i].bd.year,&students[i].bd.month,&students[i].bd.day);}
order(students,n);
for(i=0;i<n;i++)
printf("姓名：%s\n电话号码：%d\n出生日期：%4d%4d%4d\n",students[i].name,students[i].num,students[i].bd.year,students[i].bd.month,students[i].bd.day);
return 0;
}
void order(struct student students[10],int n)
{
int i,j;
struct student t;
for(i=1;i<n;i++)
for(j=0;j<n-i;j++){
if(students[j].bd.year>students[j+1].bd.year){
t=students[j];
students[j]=students[j+1];
students[j+1]=t;
}

else if(students[j].bd.month>students[j+1].bd.month){
t=students[j];
students[j]=students[j+1];
students[j+1]=t;
}

else if(students[j].bd.day>students[j+1].bd.day){
t=students[j];
students[j]=students[j+1];
students[j+1]=t;
}
}

}

 

 

 

 

 

6，按等级统计学生成绩：输入10个学生的学号，姓名和成绩，输出学生的成绩等级和不及格人数。每个学生的记录包括学号，姓名，成绩和等级，要求定义和调用函数set-grade（），根据学生成绩设置其等级，并统计不及格人数，等级设置：85~100为A,70~84为B,60~69为C,0~59为D。试编写相应程序。

#include<stdio.h>
int set_grade(struct student students[10],int n);
struct student{
int num;
char name[10];
double score;
char grade;
};
int main()
{
int n,i,count;
printf("请输入学生个数：");
scanf("%d",&n);
struct student students[10];
for(i=0;i<n;i++){
printf("姓名，学号，成绩:");
scanf("%s%d%lf",&students[i].name,&students[i].num,&students[i].score);
count=set_grade(students,n);
}
for(i=0;i<n;i++){
printf("学号：%d姓名：%s等级：%c\n",students[i].num,students[i].name,students[i].grade);
}
printf("不及格同学个数:%d\n",count);
return 0;
}
int set_grade(struct student students[10],int n)
{
int i,count=0;
for(i=0;i<n;i++)
{
if(students[i].score<60){
students[i].grade='D';
count++;}
else if(students[i].score<70&&students[i].score>=60){
students[i].grade='C';
}
else if(students[i].score<85&&students[i].score>=70){
students[i].grade='B';
}
else if(students[i].score<=100&&students[i].score>=85){
students[i].grade='A';
}
}
return count;
}