c语言学生管理系统文件操作
可以帮我改一下程序吗或者我错的太多重新写一个，还有把第4条的内容给加上，感谢 要的比较急
case 1:
{
if((fp=fopen("F:\\st.dat","r"))==NULL)
{
printf("can not open file\n");
return 0;
}
i = 0;
while(!feof(fp))
{
fscanf(fp,"%s %d %s %s %d",stu[i].name,&stu[i].id,stu[i].phone,stu[i].number,&stu[i].cj);
i++;
}
fclose(fp);
}break;
case 2:
{
if((fp1=fopen("D:\\student.dat","w"))==NULL)
{
printf("can not open file\n");
return 0;
}
printf("请输入想要修改学生的联系方式： ");
char phone1[20]="\0";
scanf("%s",phone1);
getchar();
for(int k=0;k<i;k++)
{
if(strcmp(phone1,stu[k].phone)==0)
{
printf("请输入想要修改成什么： ");
char phonec[20]="\0";
scanf("%s",phonec);
getchar();
strcpy(stu[k].phone,phonec);
printf("%s %s\n",stu[k].phone,phonec);
}
}
for(int k=0;k<i;k++)
{
fprintf(fp1,"%s %d %s %s %d",stu[i].name,stu[i].id,stu[i].phone,stu[i].number,stu[i].cj);
printf("修改成功\n");
fclose(fp1);
}break;
case 3 :
{
char name1[20]="\0";
printf("请输入需要查询的姓名：");
scanf("%s",name1);
getchar();
printf("%s\n",name1);
for(int k=0;k<i;k++)
{
if(strcmp(name1,stu[k].name)==0)
{
printf("%s %d %s %s %d",stu[i].name,stu[i].id,stu[i].phone,stu[i].number,stu[i].cj);
}
}break;
case 4:
{
int idd;
printf("请输入需要查询的学号：");
scanf("%d",&idd);
getchar();
printf("%d\n",idd);
for(int k=0;k<i;k++)
{
if(idd==stu[k].id)
{
printf("%s %d %s %s %d",stu[i].name,stu[i].id,stu[i].phone,stu[i].number,stu[i].cj);
}
}
}break;
#include <stdio.h>
#include <string.h>
struct student
{
char name[20]; //姓名
int id; //学号
char phone[20]; //电话
char number[10];//小组
float score; //成绩
};
int read(struct student stu[])
{
FILE *fp;
int n = 0;
fp = fopen("F:\\st.dat", "r");
if(fp == NULL)
{
printf("can not open file\n");
return -1;
}
while(!feof(fp))
{
fscanf(fp, "%s %d %s %s %f\n", stu[n].name, &stu[n].id, stu[n].phone, stu[n].number, &stu[n].score);
n++;
}
fclose(fp);
return n; //返回读取到的总人数
}
int modify(struct student stu[], int n)
{
int i;
char phone[20] = {0};
char phone2[20] = {0};
FILE *fp;
printf("请输入想要修改学生的联系方式： ");
scanf("%s", phone);
for(i=0; i<n; i++)
{
if(strcmp(phone, stu[i].phone) == 0)
{
printf("请输入想要修改成什么： ");
scanf("%s", phone2);
getchar();
memset(stu[i].phone, 0, sizeof(stu[i].phone));
strcpy(stu[i].phone, phone2);
printf("修改成功\n");
break;
}
}
if(i < n)
{
fp = fopen("F:\\student.dat", "w");
if(fp == NULL)
{
printf("can not open file\n");
return -1;
}
for(i=0; i<n; i++)
{
fprintf(fp, "%s\t%d\t%s\t%s\t%f\n", stu[i].name, stu[i].id,stu[i].phone, stu[i].number, stu[i].score);
printf("写入文件成功\n");
}
fclose(fp);
}
else
printf("没有该学生信息\n");
return 0;
}
int find(struct student stu[], int n)
{
int i;
char name[20] = {0};
printf("请输入需要查询的姓名： ");
scanf("%s", name);
for(i=0; i<n; i++)
{
if(strcmp(name, stu[i].name) == 0)
{
printf("查找成功，学生信息为：\n");
printf("%s\t%d\t%s\t%s\t%.1f\n", stu[i].name, stu[i].id, stu[i].phone, stu[i].number, stu[i].score);
return 0;
}
}
printf("未查找到该学生信息\n");
return -1;
}
int find2(struct student stu[], int n)
{
int i;
int id;
printf("请输入需要查询的学号：");
scanf("%d", &id);
for(i=0; i<n; i++)
{
if(id == stu[i].id)
{
printf("查找成功，学生信息为：\n");
printf("%s\t%d\t%s\t%s\t%.1f\n", stu[i].name, stu[i].id, stu[i].phone, stu[i].number, stu[i].score);
return 0;
}
}
printf("未查找到该学生信息\n");
return -1;
}
void sift(struct student stu[], int n)
{
int i, j, m = 0;
struct student s[n];
int pos[n];
FILE *fp;
fp = fopen("F:\\cji.dat", "w");
if(fp == NULL)
{
printf("can not open file\n");
return;
}
for(i=0; i<n; i++)
pos[i] = -1; //索引号全部置为-1
for(i=0; i<n; i++)
{
if(stu[i].score < 60) //找出所有小于60分的学生
{
s[m] = stu[i];
m++;
pos[i] = i; //记录小于60分的学生信息在stu中的索引号
}
}
if(m == 0)
printf("未找到成绩小于60的学生信息\n");
else
{
for(j=0; j<m; j++) //小于60分的学生
{
for(i=0; i<n; i++) //所有学生
{
if(strcmp(stu[i].number, s[j].number) == 0) //匹配同组学生
{
pos[i] = i; //记录小于60分 及其同组 的学生信息在stu中的索引号
}
}
}
for(i=0; i<n; i++)
{
if(pos[i] >= 0) //索引号不是-1的就是需要写入文件的学生信息
{
fprintf(fp, "%s\n", stu[pos[i]].name); //只写姓名
}
}
printf("写入文件成功\n");
}
fclose(fp);
}
void print(struct student stu[], int n)
{
int i;
for(i=0; i<n; i++)
printf("%s\t%d\t%s\t%s\t%.1f\n", stu[i].name, stu[i].id, stu[i].phone, stu[i].number, stu[i].score);
}
int main()
{
int select, flag = 1, n = 0;
struct student stu[100];
while(flag)
{
printf("\n学生管理系统\n");
printf("1.读取学生信息\n");
printf("2.修改学生信息\n");
printf("3.按照姓名查找学生信息\n");
printf("4.按照学号查找学生信息\n");
printf("5.筛选学生信息\n");
printf("6.退出当前页面\n");
printf("选择您的操作\n");
scanf("%d", &select);
switch (select)
{
case 1:
n = read(stu);
if(n > 0)
print(stu, n);
break;
case 2:
modify(stu, n);
print(stu, n);
break;
case 3:
find(stu, n);
break;
case 4:
find2(stu, n);
break;
case 5:
sift(stu, n);
break;
case 6:
printf("退出页面\n");
flag = 0;
break;
default:
printf("选择错误\n");
break;
}
}
printf("已退出学生管理系统\n");
return 0;
}
#include<stdio.h>
#include<windows.h>
#define Max 25
#define obj_num 5
struct Stu
{
char Name[25]; //姓名
int Number; //学号
int Language_score;//语文成绩
int Math_score; //数学成绩
int English_score; //英语成绩
int PE_score; //体育成绩
int C_score; //C语言成绩
int Sum_score; //总成绩
};
void input(struct Stu Class[],int j)
{
printf("输入第%d位同学姓名:",j+1);
scanf("%s",Class[j].Name);
getchar();
printf("输入第%d位同学学号:",j+1);
scanf("%d",&Class[j].Number);
printf("输入第%d位同学语文成绩:",j+1);
scanf("%d",&Class[j].Language_score);
printf("输入第%d位同学数学成绩:",j+1);
scanf("%d",&Class[j].Math_score);
printf("输入第%d位同学英语成绩:",j+1);
scanf("%d",&Class[j].English_score);
printf("输入第%d位同学体育成绩:",j+1);
scanf("%d",&Class[j].PE_score);
printf("输入第%d位同学C语言成绩:",j+1);
scanf("%d",&Class[j].C_score);
Class[j].Sum_score=Class[j].Language_score+Class[j].Math_score+Class[j].English_score+Class[j].PE_score+Class[j].C_score;
}
void output(struct Stu Class[],int n)
{
printf("---------------------------------------------\n");
printf("姓名 学号 语文 数学 英语 体育 C语言 总分");
printf("\n");
int j;
for(j=0; j<n; j++)
{
printf("%5s",Class[j].Name);
printf("%5d",Class[j].Number);
printf("%6d",Class[j].Language_score);
printf("%6d",Class[j].Math_score);
printf("%6d",Class[j].English_score);
printf("%6d",Class[j].PE_score);
printf("%6d",Class[j].C_score);
printf("%7d",Class[j].Sum_score);
printf("\n");
}
printf("---------------------------------------------\n");
}
void outputOne(struct Stu Class[],int j)
{
printf("姓名 学号 语文 数学 英语 体育 C语言 总分");
printf("\n");
printf("%5s",Class[j].Name);
printf("%5d",Class[j].Number);
printf("%6d",Class[j].Language_score);
printf("%6d",Class[j].Math_score);
printf("%6d",Class[j].English_score);
printf("%6d",Class[j].PE_score);
printf("%6d",Class[j].C_score);
printf("%7d",Class[j].Sum_score);
printf("\n");
}
void Sort(struct Stu Class[],int n)
{
int j,k;
struct Stu t;
for(j=0; j<n-1; j++)
{
for(k=0; k<n-j-1; k++)
{
if(Class[k].Sum_score<Class[k+1].Sum_score)
{
t=Class[k];
Class[k]=Class[k+1];
Class[k+1]=t;
}
}
}
}
int search(int number,int n,struct Stu Class[])
{
int i,p=0;
for(i=0; i<n; i++)
{
if(Class[i].Number==number)
{
p=i;
return p;
}
}
return -1;
}
void modify(int number,int n,struct Stu Class[])
{
int index=search(number,n,Class);
if(index==-1)
{
printf("找不到该学号\n");
}
else
{
printf("学号%d的学生是第%d位\n",number,index+1);
input(Class,index);
printf("修改成功\n");
output(Class,n);
}
}
void del(int number,int n,struct Stu Class[])
{
int index=search(number,n,Class);
if(index==-1)
{
printf("找不到该学号\n");
}
else
{
printf("学号%d的学生是第%d位\n",number,index);
int i;
for(i=index; i<n-1; i++)
{
Class[i]= Class[i+1];
}
printf("删除成功\n");
output(Class,n-1);
}
}
double calave(int n,struct Stu Class[],double ave[])
{
int Language_score_sum=0;
int Math_score_sum=0;
int English_score_sum=0;
int PE_score_sum=0;
int C_score_sum=0;
for(int i=0; i<n; i++)
{
Language_score_sum+=Class[i].Language_score;
Math_score_sum+=Class[i].Math_score;
English_score_sum+=Class[i].English_score;
PE_score_sum+=Class[i].PE_score;
C_score_sum+=Class[i].C_score;
}
ave[0]=(double)Language_score_sum/n;
ave[1]=(double)Math_score_sum/n;
ave[2]=(double)English_score_sum/n;
ave[3]=(double)PE_score_sum/n;
ave[4]=(double)C_score_sum/n;
}
void save(int n,struct Stu Class[])
{
FILE *fp;
fp = fopen("score_data.txt","w");
if(fp == NULL)
{
printf("error!");
return;
}
else
{
for(int j=0; j<n; j++)
{
fprintf(fp,"%s %d %d %d %d %d %d %d\n",Class[j].Name,Class[j].Number,Class[j].Language_score,Class[j].Math_score,Class[j].English_score,Class[j].PE_score,Class[j].C_score,Class[j].Sum_score);
}
printf("文件写入成功\n");
}
fclose(fp);
}
int read(int n,struct Stu Class[])
{
FILE *fp;
fp = fopen("score_data.txt","r");
int count=0;
if(fp == NULL)
{
printf("error!");
return 0;
}
else
{
for(int j=0; j<n; j++)
{
int flag=fscanf(fp,"%s %d %d %d %d %d %d %d\n",Class[j].Name,&Class[j].Number,&Class[j].Language_score,&Class[j].Math_score,&Class[j].English_score,&Class[j].PE_score,&Class[j].C_score,&Class[j].Sum_score);
if(flag!=-1) count++;
}
printf("文件读取成功\n");
}
fclose(fp);
return count;
}
void menu(struct Stu Class[])
{
int n=0,count;
int option=1;
while(option<=9&&option>=1)
{
printf("------------------------\n");
printf("------学生成绩管理------\n");
printf("------1.输入成绩 ------\n");
printf("------2.输出成绩 ------\n");
printf("------3.按总成绩排序----\n");
printf("------4.按学号查询成绩--\n");
printf("------5.修改信息 ------\n");
printf("------6.删除学生 ------\n");
printf("------7.计算各科平均分--\n");
printf("------8.文件读入 ------\n");
printf("------9.保存至文件------\n");
printf("------other.退出 ------\n");
printf("------------------------\n");
printf("输入选项：");
scanf("%d",&option);
switch(option)
{
case 1:
{
system("cls");
printf("输入学生的个数(不大于%d):",Max-n);
scanf("%d",&count);
while(count--)
{
input(Class,n++);
}
output(Class,n);
break;
}
case 2:
{
system("cls");
output(Class,n);
break;
}
case 3:
{
system("cls");
Sort(Class,n);
output(Class,n);
break;
}
case 4:
{
system("cls");
int number;
printf("输入要查找的学号：");
scanf("%d",&number);
int index=search(number,n,Class);
if(index==-1)
{
printf("查找失败\n");
}
else
{
printf("查找成功\n");
outputOne(Class,index);
}
break;
}
case 5:
{
system("cls");
output(Class,n);
int number;
printf("输入要修改成绩的学生对应的学号：");
scanf("%d",&number);
modify(number,n,Class);
output(Class,n);
break;
}
case 6:
{
system("cls");
output(Class,n);
int number;
printf("输入要删除的学号：");
scanf("%d",&number);
del(number,n,Class);
n--;
system("cls");
output(Class,n);
break;
}
case 7:
{
system("cls");
output(Class,n);
double ave[obj_num];
calave(n,Class,ave);
char str[]="平均分";
printf("\n");
printf("%5s",str);
printf(" ");
printf("%5.2lf",ave[0]);
printf("%6.2lf",ave[1]);
printf("%6.2lf",ave[2]);
printf("%6.2lf",ave[3]);
printf("%6.2lf",ave[4]);
printf("\n");
break;
}
case 8:
{
system("cls");
n-=n;
n+=read(Max,Class);
break;
}
case 9:
{
system("cls");
save(n,Class);
break;
}
default :
{
break;
}
}
}
}
int main()
{
struct Stu Class [Max];
menu(Class);
return 0;
}