#include<stdio.h>
#include<string.h>
#include<stdlib.h>
#define MAX 10000
void add_student();
void edit_student();
void del_student();
void select_student_by_name();
void select_student_by_score();
void query_student();
void print_student();
void IO_write();
void IO_read();
void config_write();
void config_read();
//返回此学生学号对应的索引
int verify_sno();
typedef struct stu{
char sno[40];//10大小
char name[40];//20大小
float math_score;//4
float englist_score;//4
long age;
float avg_score;
}Stu;
char is_continue[0];
char sno[10];char name[20];
float math_score,englist_score,avg_score;
int num=0;//学生数量
int res;
FILE * fp;
int main(){
int choose_num;//选择方式
Stu * student;
student = (Stu *)malloc(10*(sizeof(Stu)));
if(student==NULL){
printf("动态分配内存失败\n");
}
if(num==0){//刚启动
config_read();
}
while(1){
printf("\n------ 学生成绩管理系统------\n");
printf("1. 增加学生记录\n");
printf("2. 修改学生记录\n");
printf("3. 删除学生记录\n");
printf("4. 显示所有学生信息\n");
printf("5. 按姓名查询学生记录\n");
printf("6. 按平均成绩排序\n");
printf("7. 退出\n");
printf("请选择(1-7):");
scanf("%d",&choose_num);
switch(choose_num){
case 1://增加学生
add_student(student);
break;
case 2://修改学生
edit_student(student);
break;
case 3://删除学生记录
del_student(student);
break;
case 4://显示所有学生信息
query_student(student);
break;
case 5://按照学生姓名查询学生记录
select_student_by_name(student);
break;
case 6://按照平均成绩查询学生记录
select_student_by_score(student);
break;
default:
exit(0);
break;
}
}
}
void add_student(Stu * student){
while(1){
printf("请输入学生学号:");
scanf("%s",sno);
res = verify_sno(student);
if(res != -1){
printf("已经具有这个学号的学生了\n");
printf("请重新输入\n");
continue;
}
printf("请输入学生姓名:");
scanf("%s",name);
printf("请输入数学成绩:");
scanf("%f",&math_score);
printf("请输入英语成绩:");
scanf("%f",&englist_score);
memcpy(student[num].sno,sno,50);
memcpy(student[num].name,name,50);
student[num].math_score = math_score;
student[num].englist_score = englist_score;
student[num].avg_score = (math_score+englist_score)/2;
num++;
IO_write(student);
printf("是否继续，请输入Y/N\n");
scanf("%s",is_continue);
getchar();//清除缓冲区中的欢迎符号
if(strcmp(is_continue,"N")==0){
break;
}
}
}
void query_student(Stu * student){
while(1){
IO_read(student);
print_student(student);
printf("是否继续，请输入Y/N\n");
scanf("%s",is_continue);
getchar();//清除缓冲区中的欢迎符号
if(strcmp(is_continue,"N")==0){
break;
}
}
}
void edit_student(Stu * student){
while(1){
int index;
printf("输入要修改的学生的编号\n");
scanf("%d",&index);
if(index<1 || index>num){
printf("输入的编号不存在\n");
break;
}
printf("请输入学生学号:");
scanf("%s",sno);
res = verify_sno(student);
if(res != -1){
printf("已经具有这个学号的学生了\n");
printf("请重新输入\n");
continue;
}
printf("请输入学生姓名:");
scanf("%s",name);
printf("请输入数学成绩:");
scanf("%f",&math_score);
printf("请输入英语成绩:");
scanf("%f",&englist_score);
memcpy(student[index-1].sno,sno,50);
memcpy(student[index-1].name,name,50);
student[index-1].math_score = math_score;
student[index-1].englist_score = englist_score;
student[index-1].avg_score = (math_score+englist_score)/2;
IO_write(student);
printf("是否继续，请输入Y/N\n");
scanf("%s",is_continue);
getchar();//清除缓冲区中的欢迎符号
if(strcmp(is_continue,"N")==0){
break;
}
}
}
void del_student(Stu * student){
IO_read(student);
while(1){
int i;
int res;
printf("输入要删除的学生的学号\n");
scanf("%s",sno);
res = verify_sno(student);
if(res==-1){
printf("没有此学生\n");
printf("请重新输入\n");
continue;
}
if((res+1)==num){//删除的学生是最后一位
num--;
IO_write(student);
}else{//不是最后一位
num--;
for(i=res;i<num;i++){
memcpy(student[i].sno,student[i+1].sno,50);
memcpy(student[i].name,student[i+1].name,50);
student[i].math_score = student[i+1].math_score;
student[i].englist_score = student[i+1].englist_score;
}
IO_write(student);
}
printf("是否继续，请输入Y/N\n");
scanf("%s",is_continue);
getchar();//清除缓冲区中的欢迎符号
if(strcmp(is_continue,"N")==0){
break;
}
}
}
void select_student_by_name(Stu * student){
while(1){
IO_read(student);
int i;
printf("输入学生姓名\n");
scanf("%s",name);
printf(" 编号 学生学号 学生姓名 数学成绩 英语成绩\n");
for(i=0;i<num;i++){
if(strcmp(student[i].name,name)==0){
printf(" %d %s %s %f %f \n",i+1,student[i].sno,student[i].name,student[i].math_score,student[i].englist_score);
}
}
printf("是否继续，请输入Y/N\n");
scanf("%s",is_continue);
getchar();//清除缓冲区中的欢迎符号
if(strcmp(is_continue,"N")==0){
break;
}
}
}
void select_student_by_score(Stu * student){
while(1){
IO_read(student);
int i,j;
for(i=0;i<num-1;i++){
for(j=0;j<num-i-1;j++){
if(student[j].avg_score>=student[j+1].avg_score){
memcpy(sno,student[j].sno,50);
memcpy(name,student[j].name,50);
math_score = student[j].math_score;
englist_score = student[j].englist_score;
avg_score = student[j].avg_score;
memcpy(student[j].sno,student[j+1].sno,50);
memcpy(student[j].name,student[j+1].name,50);
student[j].math_score = student[j+1].math_score;
student[j].englist_score = student[j+1].englist_score;
student[j].avg_score = student[j+1].avg_score;
memcpy(student[j+1].sno,sno,50);
memcpy(student[j+1].name,name,50);
student[j+1].math_score = math_score;
student[j+1].englist_score = englist_score;
student[j+1].avg_score = avg_score;
}
}
}
printf(" 编号 学生学号 学生姓名 数学成绩 英语成绩\n");
for(i=0;i<num;i++){
printf(" %d %s %s %f %f \n",i+1,student[i].sno,student[i].name,student[i].math_score,student[i].englist_score);
}
printf("是否继续，请输入Y/N\n");
scanf("%s",is_continue);
getchar();//清除缓冲区中的欢迎符号
if(strcmp(is_continue,"N")==0){
break;
}
}
}
void IO_write(Stu * student){
FILE *fp;
int i;
fp = fopen("student.txt","wb");
if(fp==NULL){
printf("打开文件失败\n");
exit(0);
}
for(i=0;i<num;i++){
if(fwrite(&student[i],sizeof(struct stu),1,fp)!=1){
printf("写入失败\n");
fclose(fp);
}
}
fclose(fp);
config_write();
}
void print_student(Stu * student){
int i;
if(num==0){
printf("暂无学生信息\n");
return;
}
printf(" 编号 学生学号 学生姓名 数学成绩 英语成绩\n");
for(i=0;i<num;i++){
printf(" %d %s %s %f %f \n",i+1,student[i].sno,student[i].name,student[i].math_score,student[i].englist_score);
}
}
void IO_read(Stu * student){
FILE *fp;
int i;
fp = fopen("student.txt","rb");
if(fp==NULL){
printf("打开文件失败\n");
exit(0);
}
for(i=0;i<num;i++){
fread(&student[i],sizeof(struct stu),1,fp);
}
fclose(fp);
}
void config_write(){
fp = fopen("config.txt","wb");
if(fp==NULL){
printf("打开文件失败\n");
exit(0);
}
if(fwrite(&num,sizeof(int),1,fp)!=1){
printf("写入失败\n");
fclose(fp);
}
fclose(fp);
}
void config_read(){
fp = fopen("config.txt","rb");
if(fp==NULL){
printf("打开文件失败\n");
exit(0);
}
fread(&num,sizeof(int),1,fp);
fclose(fp);
}
/**
*验证是否已经有重复的学号
*/
int verify_sno(Stu * student){
int i;
IO_read(student);
for(i=0;i<num;i++){
if(strcmp(student[i].sno,sno)==0){//学号相同
return i;
}
}
return -1;
}
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