C语言程序设计-笔记8-结构
C语言程序设计-笔记8-结构
例9-1 输出平均分最高的学生信息。根据学生的基本信息包括学号、姓名、三门课程成绩以及个人平均成绩。输入n个学生的成绩信息，计算并输出平均分最高的学生信息。
#include<stdio.h>
struct student{
int num;
char name[10];
int computer,english,math;
double average;
};
int main(void)
{
int i,n;
struct student max,stu;
printf("Input n:");
scanf("%d",&n);
printf("Input the student's number,name and course scores\n");
for(i=1;i<=n;i++)
{
printf("No.%d:",i);
scanf("%d%s%d%d%d",&stu.num,stu.name,&stu.math,&stu.english,
&stu.computer);
stu.average=(stu.math+stu.english+stu.computer)/3.0;
if(i==1)
{
max=stu;
}
else if(max.average<stu.average)
{
max=stu;
}
}
printf("num:%d,name:%s,average:%.2f\n",max.num,max.name,max.average);
return 0;
}
例9-2 学生成绩排序。输入n（n〈50）个学生的成绩信息，按照学生的个人平均成绩从高到低输出他们的信息。
#include<stdio.h>
struct student{
int num;
char name[10];
int computer,english,math;
double average;
};
int main(void)
{
int i,index,j,n;
struct student students[50],temp;
printf("Input n:");
scanf("%d",&n);
for(i=0;i<n;i++)
{
printf("Input the info of No.%d:\n",i+1);
printf("number:");
scanf("%d",&students[i].num);
printf("name:");
scanf("%s",students[i].name);
printf("math score:");
scanf("%d",&students[i].math);
printf("english score:");
scanf("%d",&students[i].english);
printf("computer score:");
scanf("%d",&students[i].computer);
students[i].average=(students[i].math+students[i].english+
students[i].computer)/3.0;
}
for(i=0;i<n-1;i++)
{
index=i;
for(j=i+1;j<n;j++)
{
if(students[j].average>students[index].average)
{
index=j;
}
}
temp=students[index];
students[index]=students[i];
students[i]=temp;
}
printf("num\t name\t average\n");
for(i=0;i<n;i++)
{
printf("%d \t%s \t%.2f\n",students[i].num,students[i].name,
students[i].average);
}
return 0;
}
例9-3 修改学生成绩。输入n(n<50)个学生的成绩信息，再输入一个学生的学号、课程以及成绩，在自定义函数中修改该学生指定课程的成绩。
#include<stdio.h>
struct student{
int num;
char name[10];
int computer,english,math;
double average;
};
int update_score(struct student *p,int n,int num,int course,int score);
int main(void)
{
int course,i,n,num,pos,score;
struct student students[50];
printf("Input n:");
scanf("%d",&n);
for(i=0;i<n;i++)
{
printf("Input the info of No.%d:\n",i+1);
printf("number:");
scanf("%d",&students[i].num);
printf("name:");
scanf("%s",students[i].name);
printf("math score:");
scanf("%d",&students[i].math);
printf("english score:");
scanf("%d",&students[i].english);
printf("computer score:");
scanf("%d",&students[i].computer);
}
printf("Input the number of the students to be updated:");
scanf("%d",&num);
printf("Choice the course:1.math 2.english 3.computer:");
scanf("%d",&course);
printf("Input the new score:");
scanf("%d",&score);
pos=update_score(students,n,num,course,score);
if(pos==-1)
{
printf("Not found!\n");
}
else
{
printf("After update:\n");
printf("num\t math\t english\t computer\n");
printf("%d\t %d\t %d\t %d\n",students[pos].num,students[pos].math,
students[pos].english,students[pos].computer);
}
return 0;
}
int update_score(struct student *p,int n,int num,int course,int score)
{
int i,pos;
for(i=0;i<n;i++,p++)
{
if(p->num==num)
{
break;
}
}
if(i<n)
{
switch(course)
{
case 1:p->math=score;break;
case 2:p->english=score;break;
case 3:p->computer;break;
}
pos=i;
}
else
{
pos=-1;
}
return pos;
}
参考资料
C语言程序设计/何钦铭，颜晖主编.---4版.---北京：高等教育出版社，2020.9
