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