#include

#include

#include

#include

#include

using namespace std;

struct Student{

char id[20];

char name[20];

double chinese;

double math;

double english;

double average;

};

int totalrecords = 0;

struct Student student[1001];

void fun01(){

printf("学号 姓名 语文 数学 英语\n");

for(int i = 0; i < totalrecords; i++){

printf("%s\t%s\t%.1lf\t%.1lf\t%.1lf\n", student[i].id, student[i].name, student[i].chinese, student[i].math, student[i].english);

}

}

void fun02(){

printf("请输入学生学号,姓名,语文成绩,数学成绩,英语成绩，以空格隔开：\n");

char id[20];

char name[20];

double chinese;

double math;

double english;

scanf("%s %s %lf %lf %lf", id, name, &chinese, &math, &english);

strcpy(student[totalrecords].id, id);

strcpy(student[totalrecords].name, name);

student[totalrecords].chinese = chinese;

student[totalrecords].math = math;

student[totalrecords].english = english;

totalrecords++;

printf("信息录入成功！\n");

}

void fun03(){

for(int i = 0; i < totalrecords; i++){

student[i].average = (student[i].chinese + student[i].math + student[i].english) / 3;

}

printf("计算结果为：\n");

printf("学号 姓名 语文 数学 英语 平均成绩\n");

for(int i = 0; i < totalrecords; i++){

printf("%s\t%s\t%.1lf\t%.1lf\t%.1lf\t%.1lf\n", student[i].id, student[i].name, student[i].chinese, student[i].math, student[i].english, student[i].average);

}

}

void fun04(){

printf("请输入待修改学生学号：\n");

char id01[20];

scanf("%s", id01);

char id[20];

char name[20];

double chinese;

double math;

double english;

for(int i = 0; i < totalrecords; i++){

if(strcmp(id01, student[i].id) == 0){

printf("请输入修改后的学生学号,姓名,语文成绩，数学成绩，英语成绩，以空格隔开以空格隔开：\n");

scanf("%s %s %lf %lf %lf", id, name, &chinese, &math, &english);

//赋值给结构体数组

strcpy(student[i].id, id);

strcpy(student[i].name, name);

student[i].chinese = chinese;

student[i].math = math;

student[i].english = english;

printf("修改成功！\n");

return ;

}

}

printf("查找失败！请重新输入！\n");

}

void fun05(){

printf("--1.学号--2.姓名--\n");

printf("请输入编号(1-2),按编号指定字段查询：");

int pos;

scanf("%d", &pos);

printf("请输入字段值:\n");

char str[100];

switch (pos){

case 1: {

scanf("%s", str);

//遍历数组，查询到符合要求的就输出

printf("查询到的结果为：\n");

for(int i = 0; i < totalrecords; i++){

if(strcmp(str, student[i].id) == 0){

printf("%s\t%s\t%.1lf\t%.1lf\t%.1lf\n", student[i].id, student[i].name, student[i].chinese, student[i].math, student[i].english);

}

}

}; break;

case 2: {

scanf("%s", str);

//遍历数组，查询到符合要求的就输出

printf("查询到的结果为：\n");

for(int i = 0; i < totalrecords; i++){

if(strcmp(str, student[i].name) == 0){

printf("%s\t%s\t%.1lf\t%.1lf\t%.1lf\n", student[i].id, student[i].name, student[i].chinese, student[i].math, student[i].english);

}

}

}; break;

default:printf("error\n");

}

}

void fun06(){

//先将平均成绩计算出来

for(int i = 0; i < totalrecords; i++){

student[i].average = (student[i].chinese + student[i].math + student[i].english) / 3;

}

printf("请输入一个分数，系统将查出所有平均成绩大于此分数的学生信息：\n");

double score;

scanf("%lf", &score);

for(int i = 0; i < totalrecords; i++){

if(student[i].average > score){

printf("%s\t%s\t%.1lf\t%.1lf\t%.1lf\t%.1lf\n", student[i].id, student[i].name, student[i].chinese, student[i].math, student[i].english, student[i].average);

}

}

}

void fun07(){

//先将平均成绩计算出来

for(int i = 0; i < totalrecords; i++){

student[i].average = (student[i].chinese + student[i].math + student[i].english) / 3;

}

printf("--1.降序--2.升序--\n");

printf("请输入编号(1-2),按指定方式排序：");

int pos;

scanf("%d", &pos);

Student tmp;

switch (pos){

case 1: {

for(int i = 0; i < totalrecords; i++){

for(int j = 0; j < totalrecords - i - 1; j++){

if(student[j].average < student[j+1].average){

tmp = student[j+1];//结构体允许整体赋值

student[j+1] = student[j];

student[j] = tmp;

}

}

}

printf("学号 姓名 语文 数学 英语 平均成绩\n");

for(int i = 0; i < totalrecords; i++){

printf("%s\t%s\t%.1lf\t%.1lf\t%.1lf\t%.1lf\n", student[i].id, student[i].name, student[i].chinese, student[i].math, student[i].english, student[i].average);

}

}; break;

case 2: {

for(int i = 0; i < totalrecords; i++){

for(int j = 0; j < totalrecords - i - 1; j++){

if(student[j].average > student[j+1].average){

tmp = student[j+1];//结构体允许整体赋值

student[j+1] = student[j];

student[j] = tmp;

}

}

}

printf("学号 姓名 语文 数学 英语 平均成绩\n");

for(int i = 0; i < totalrecords; i++){

printf("%s\t%s\t%.1lf\t%.1lf\t%.1lf\t%.1lf\n", student[i].id, student[i].name, student[i].chinese, student[i].math, student[i].english, student[i].average);

}

}; break;

default:printf("error\n");

}

}

void fun08(){

FILE *fp;//文件指针

int i;

fp=fopen("C:\\Users\\larry\\Desktop\\stu.txt","w");/*以只在文件末尾写的方式打开文件*/

for(i = 0; i < totalrecords; i++)

{

fprintf(fp, "%s %s %.1lf %.1lf %.1lf", student[i].id, student[i].name, student[i].chinese, student[i].math, student[i].english);

fprintf(fp, "\n");

}

fclose(fp);

printf("已完成保存！\n");

}

void fun09(){

int a;

printf("即将退出系统，是否保存(1/0)?\n");

scanf("%d", &a);

if(a == 1){

fun08();

printf("欢迎下次使用！\n");

exit(0);

}else{

printf("数据未保存，已成功退出，欢迎下次使用！\n");

exit(0);

}

}

int main(){

char pwd[100];

printf("请输入密码：\n");

scanf("%s", pwd);

if(strcmp(pwd, "0000") == 0){

printf("********************************************\n");

printf("********************************************\n");

printf("**************学生成绩管理系统**************\n");

printf("********************************************\n");

printf("******1.所有记录*********2.学生信息录入*****\n");

printf("********************************************\n");

printf("******3.平均成绩计算*****4.信息修改*********\n");

printf("********************************************\n");

printf("******5.信息查询*********6.成绩统计*********\n");

printf("********************************************\n");

printf("******7.成绩排序*********8.信息存盘*********\n");

printf("********************************************\n");

printf("***************0.退出系统*******************\n");

printf("********************************************\n");

printf("********************************************\n");

printf("********************************************\n");

int flag;

while(true){

printf("请输入操作编号,回车键结束：");

scanf("%d", &flag);

switch (flag){

case 1: fun01(); break;

case 2: fun02(); break;

case 3: fun03(); break;

case 4: fun04(); break;

case 5: fun05(); break;

case 6: fun06(); break;

case 7: fun07(); break;

case 8: fun08(); break;

case 0: fun09(); break;

default:printf("error\n");

}

}

return 0;

} else{

printf("密码错误!");

}

return 0;

}

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