#include "conio.h"
#include "stdlib.h"
#include "string.h"
int studentNum = 0
#define MAXSTUDENT (1024)
#define CheckData()\
{\
if(!studentNum)\
{\
printf("没有学生数据，按任意键返回……\n")\
getch()\
return\
}\
}\
typedef struct Student
{
int id
int cScore
int mathScore
}Student
void ClearStudent(Student* student)
{
memset((void*)student,0,sizeof(*student))
}
void ShowMainMenu()
{
system("cls")
printf("1.增加记录\n2.计算每个学生的总成绩\n3.计算每门课程的平均成绩\n4.按座号查询学生的成绩\n5.按总分排名\n6.输出前n名的学生的成绩\n7.修改成绩\n0.退出\n")
}
void ShowCountScore(const Student* student)
{
system("cls")
CheckData()
for(int i = 0i <studentNumi++)
printf("学生%04d的总成绩：%d\n",(student+i)->id,(student+i)->cScore+(student+i)->mathScore)
printf("\n按任意键继续……")
getch()
}
void ShowClassAvg(const Student* student)
{
system("cls")
CheckData()
double sumc = 0
double summath = 0
for(int i = 0i <studentNumi++)
{
sumc += (student+i)->cScore
summath += (student+i)->mathScore
}
printf("C语言平均成绩为：%lf\n",sumc/studentNum)
printf("数学平均成绩为：%lf\n",summath/studentNum)
printf("\n按任意键继续……")
getch()
}
void AddStudent(Student* student)
{
system("cls")
if(studentNum == MAXSTUDENT)
{
printf("人数已满，按任意键返回……\n")
getch()
}
printf("分别录入座号、C语言成绩、数学成绩：\n")
int id = 0
int cScore = 0
int mathScore = 0
scanf("%d%d%d",&id,&cScore,&mathScore)
for(int i = 0 i <studentNumi++)
if((student+i)->id == id)
{
printf("座号重复，按任意键返回……\n")
getch()
return
}
(student+studentNum)->id = id
(student+studentNum)->cScore = cScore
(student+studentNum)->mathScore = mathScore
studentNum++
}
void SelectFromID(const Student* student)
{
system("cls")
CheckData()
printf("输入查询ID:\n")
int id = 0
scanf("%d",&id)
printf("查询结果:\n")
for(int i = 0i<studentNumi++)
if(id == (student+i)->id)
{
printf("C语言成绩为：%d\n数学成绩为：%d\n",(student+i)->cScore,(student+i)->mathScore)
break
}
printf("\n按任意键继续……")
getch()
}
void SortForCount(Student* student)
{
system("cls")
CheckData()
for(int i = 0i <studentNumi++)
{
for(int j = studentNum -1j >ij--)
if(((student+j)->cScore+(student+j)->mathScore) >((student+j-1)->cScore+(student+j-1)->mathScore))
{
Student stu
stu = *(student+j)
*(student+j) = *(student+j-1)
*(student+j-1) = stu
}
}
}
void SortForN(Student* student,int n)
{
SortForCount(student)
if(!studentNum)
return
n = n>studentNum?studentNum:n
for(int i = 0i<ni++)
printf("第%d名：\nID：%d\nC语言成绩为：%d\n数学成绩为：%d\n总分为：%d\n\n",i+1,(student+i)->id,(student+i)->cScore,(student+i)->mathScore,(student+i)->cScore+(student+i)->mathScore)
printf("\n按任意键继续……")
getch()
}
void UpdateScore(Student* student)
{
system("cls")
CheckData()
printf("输入修改ID:\n")
int id = 0
scanf("%d",&id)
int i = 0
for(i<studentNumi++)
if(id == (student+i)->id)
break
if(i == studentNum)
printf("\n查无此人，按任意键继续……")
else
{
printf("输入欲修改的C语言成绩、数学成绩：\n")
int cScore = 0
int mathScore = 0
scanf("%d%d",&cScore,&mathScore)
(student+i)->cScore=cScore
(student+i)->mathScore = mathScore
printf("\n按任意键继续……")
}
getch()
}
void RunStudent(Student* student)
{
while(1)
{
ShowMainMenu()
char chGet = getch()
switch(chGet)
{
case '1':
AddStudent(student)
break
case '2':
ShowCountScore(student)
break
case '3':
ShowClassAvg(student)
break
case '4':
SelectFromID(student)
break
case '5':
SortForCount(student)
for(int i =0i<studentNumi++)
printf("第%d名：\nID：%d\nC语言成绩为：%d\n数学成绩为：%d\n总分为：%d\n\n",i+1,(student+i)->id,(student+i)->cScore,(student+i)->mathScore,(student+i)->cScore+(student+i)->mathScore)
printf("\n按任意键继续……")
getch()
break
case '6':
{
int n = 0
printf("输入N：\n")
scanf("%d",&n)
SortForN(student,n)
}
break
case '7':
UpdateScore(student)
break
case '0':
return
default:
break
}
}
}
int main()
{
Student* allStudent = (Student*)malloc(MAXSTUDENT*sizeof(Student))
memset((void*)allStudent,0,MAXSTUDENT*sizeof(Student))
RunStudent(allStudent)
return 0
}
//修改的 #include"iostream.h" struct student { int IDNumberchar Nameint Agechar Departmentfloat As}student s[5]//创建结构体对象时没有确定数组的大小 void main() { char tempint i=1do { cout<<"请输入学号:"cin>>s[i].IDNumbercout<<"请输入姓名:"cin>>s[i].Namecout<<"请输入年龄:"cin>>s[i].Agecout<<"请输入学院信息:"cin>>s[i].Departmentcout<<"请输入平均成绩:"cin>>s[i].Asi++cout<<"是否需要输入下一位学生的信息: (Y/N)? "cin>>temp}while(temp=='Y'||temp=='y')//这里的&&修改为||否则按了Y也会退出 } 按上面修改就可以运行了，不过还是有问题：你是想循环输入，直到输入N为止，我这里修改的代码已经确定了数组的大小，所以当你连续输入超过5次的话就会出错。如果要解决这问题可以用链表或动态创建数组也可以。楼主要实现循环，请注意看我这下的注释。最下面的那个。运行过了。OK的
#include<stdio.h>
#include<stdlib.h>
#include <conio.h>
void input(void)//要声明
struct student
{
char name[20]
int id
int chinese
int math
int english
}stu[30]
int count=0
void main(void)
{
int c
char a
printf("\n\n\t\t\t\twelcome\n")
printf("\n")
printf("\n")
printf("\n")
printf("\********************************************************************************\n")
printf("\n")
printf("\n\n\t\t\t\t1.input" )
printf("\n\n\t\t\t\t2.")
printf("\n\n\t\t\t\t3. ")
printf("\n\n\t\t\t\t4.")
printf("\n\n\t\t\t\t5.break")
printf("\n")
printf("\n")
printf("\n")
printf("please choose the option\n")
scanf("%d",&c)
switch(c)
{
case 1:
{
input()
break
}
case 5:
return 0
break
}
}
void input(void)//这要用void
{
char c
do
{
printf("input information:\n")
printf("name:\n")
scanf("%s",&stu[count].name)
printf("id:\n")
scanf("%d",&stu[count].id)
printf("chinese:\n")
scanf("%d",&stu[count].chinese)
printf("math:\n")
scanf("%d",&stu[count].math)
printf("english:\n")
scanf("%s",&stu[count].english)
fflush(stdin)//主要是这句。清空前面的换存。要不存的字母c就成了回车键。当然无从判断了。也可以用getchar()把回车键存起来
printf("continue?(Y/N):")
c=getchar()
count++//这个要加1
}while(c=='Y'||c=='y')
}
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