模拟计算新高考位次排名，C/C++，数据结构与算法，课程设计

原创已于 2023-12-29 01:59:05 修改 · 762 阅读

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#c++

于 2023-12-15 14:47:17 首次发布

文章描述了一个使用C++编写的程序，涉及文件操作，包括从文本文件中读取学生数据，自定义比较函数用于计算并排序学生的总成绩，最后输出排名。

mede by wit cym.

#include<bits/stdc++.h>
using namespace std;
struct Student{
    string id;
    string name;
    int chinese;
    int math;
    int english;
    int ele1;
    int ele2;
    int ele3;
    char grade;
};
int sum1(Student student) {//语数英成绩
    return student.chinese+student.math+student.english;
}
int sum2(Student student) {//总成绩
    return sum1(student)+student.ele1+student.ele2+student.ele3;
}
bool compare(Student a, Student b){//自定义比较函数
    if(sum2(a)>sum2(b)) return 1;
    else if(sum2(a)<sum2(b)) return 0;
    else{
        if(a.grade<b.grade) return 1;
        else if(a.grade>b.grade) return 0;
        else{
            if(sum1(a)>sum1(b)) return 1;
            else return 0;
        }
    }
}
void readStudent(string filename, Student students[]){
    FILE* file = fopen(filename.c_str(), "r");
    if (!file) {
        cout<<"文件打开失败\n";
        system("pause");
        system("exit");
    }
    while (fscanf(file, "%s %s %d %d %d %d %d %d %c",
                  &students[numStudents].id,
                  &students[numStudents].name,
                  &students[numStudents].chinese,
                  &students[numStudents].math,
                  &students[numStudents].english,
                  &students[numStudents].ele1,
                  &students[numStudents].ele2,
                  &students[numStudents].ele3,
                  &students[numStudents].grade) != EOF){
        numStudents++;
    }
    fclose(file);
}
void outputRanking(Student students[]){
    cout<<"新高考位次结果：\n";
    for (int i=0; i<numStudents; i++) {
        cout<<students[i].id<<' '
        <<students[i].name<<' '
        <<students[i].chinese<<' '
        <<students[i].math<<' '
        <<students[i].english<<' '
        <<students[i].ele1<<' '
        <<students[i].ele2<<' '
        <<students[i].ele3<<' '
        <<students[i].grade<<'\n';
    }
}

const int MAX_STUDENTS = 100;//最大容量
int numStudents = 0;//学生个数
Student students[MAX_STUDENTS];
int main(){
    readStudent("D:/student_data.txt", students);
    sort(students, students+numStudents, compare);
    outputRanking(students);
    return 0;
}

下面更新一下用c++文件操作优化后的读入写出函数，应该没错滴

void readStudent(string filename, Student students[]){
    ifstream fin(filename);
    if (!fin.is_open()) {
        cout<<"文件打开失败\n";
        system("pause");
        exit(0);
    }
    string buffer;
    while(fin>>buffer){
        string temp[9];
        stringsplit(buffer, ' ', temp);
        students[numStudents].id=temp[0];
        students[numStudents].name=temp[1];
        students[numStudents].chinese=int(temp[2].c_str());
        students[numStudents].math=int(temp[3].c_str());
        students[numStudents].english=int(temp[4].c_str());
        students[numStudents].ele1=int(temp[5].c_str());
        students[numStudents].ele2=int(temp[6].c_str());
        students[numStudents].ele3=int(temp[7].c_str());
        students[numStudents].grade=char(temp[8].c_str());
        numStudents++;
    }
    fin.close();
}//下为分割string的函数
void stringsplit(const string str, char split, string arr[9]){
	char* cstr = new char[str.size() + 1];
	strcpy(cstr, str.c_str());//将str拷贝到char类型的strc
    char* csplit = &split;
	char* temp = strtok(cstr, csplit);
    int cnt=0;
	while (temp != NULL)
	{
		arr[cnt++]=string(temp);		
		temp = strtok(NULL, csplit);//下一个被分割的串
	}
	delete[] cstr;
}

void outputRanking(string filename, Student students[]){
    ofstream fout(filename);
    for (int i=0; i<numStudents; i++) {
        fout<<students[i].id<<' '
        <<students[i].name<<' '
        <<students[i].chinese<<' '
        <<students[i].math<<' '
        <<students[i].english<<' '
        <<students[i].ele1<<' '
        <<students[i].ele2<<' '
        <<students[i].ele3<<' '
        <<students[i].grade<<'\n';
    }
    fout.close();
}