作业五

作者：tANGjIAqIAN

题目1

#include <stdio.h>

// 结构体
struct Student {
    char id[12];
    char name[11];
    int mathScore;
    int englishScore;
    int programmingScore;
};

// 输入学生信息
void InputStudent(struct Student *student) {
    scanf("%s %s %d %d %d", student->id, student->name, &student->mathScore, &student->englishScore, &student->programmingScore);
}

// 输出学生信息
void OutputStudent(struct Student *student) {
    printf("%s %10s %d %d %d\n", student->id, student->name, student->mathScore, student->englishScore, student->programmingScore);
}

int main() {
    int n;
    scanf("%d", &n);
    struct Student students[n];
    for (int i = 0; i < n; i++) {
        InputStudent(&students[i]);
    }
    for (int i = 0; i < n; i++) {
        OutputStudent(&students[i]);
    }
    return 0;
}

题目二

#include <stdio.h>
#include <string.h>
// 结构体
struct Student {
    char id[12];
    char name[11];
    int mathScore;
    int englishScore;
    int programmingScore;
};

// 输入学生信息
void InputStudent(struct Student *student) {
    scanf("%s %s %d %d %d", student->id, student->name, &student->mathScore, &student->englishScore, &student->programmingScore);
}

// 输出学生信息
void OutputStudent(struct Student *student) {
    printf("%s %10s %d %d %d\n", student->id, student->name, student->mathScore, student->englishScore, student->programmingScore);
}
// 根据姓名查找学生信息
void FindStudentByName(struct Student *students, int n, char *name) {
    int found = 0;
    for (int i = 0; i < n; i++) {
        if (strcmp(students[i].name, name) == 0) {
            OutputStudent(&students[i]);
            found = 1;
            break;
        }
    }
    if (!found) {
        printf("Not Found!\n");
    }
}


int main() {
    int n;
    scanf("%d", &n);
    struct Student students[n];
    for (int i = 0; i < n; i++) {
        InputStudent(&students[i]);
    }
    char name[11];
    scanf("%s", name);
    FindStudentByName(students, n, name);
    return 0;
}

题目三

#include <stdio.h>
#include <string.h>
// 结构体
struct Student {
    char id[12];
    char name[11];
    int mathScore;
    int englishScore;
    int programmingScore;
};

// 输入学生信息
void InputStudent(struct Student *student) {
    scanf("%s %s %d %d %d", student->id, student->name, &student->mathScore, &student->englishScore, &student->programmingScore);
}

// 输出学生信息
void OutputStudent(struct Student *student) {
    printf("%s %10s %d %d %d\n", student->id, student->name, student->mathScore, student->englishScore, student->programmingScore);
}
// 根据姓名查找学生信息
void FindStudentByName(struct Student *students, int n, char *name) {
    int found = 0;
    for (int i = 0; i < n; i++) {
        if (strcmp(students[i].name, name) == 0) {
            OutputStudent(&students[i]);
            found = 1;
            break;
        }
    }
    if (!found) {
        printf("Not Found!\n");
    }
}
// 计算平均分
void computeAverage(struct Student *students, int n) {
    // 计算学生成绩的平均分
    printf("学生成绩的平均分:\n");
    for (int i = 0; i < n; i++) {
        double average = (students[i].mathScore + students[i].englishScore + students[i].programmingScore) / 3.0;
        printf("%s %.4lf\n", students[i].id, average);
    }

    // 计算每门课的平均分
    printf("三门课的平均分:\n");
    double mathSum = 0, englishSum = 0, programSum = 0;
    for (int i = 0; i < n; i++) {
        mathSum += students[i].mathScore;
        englishSum += students[i].englishScore;
        programSum += students[i].programmingScore;
    }
    double mathAverage = mathSum / n;
    double englishAverage = englishSum / n;
    double programAverage = programSum / n;
    printf("Math:    %6.4lf\n", mathAverage);
    printf("English: %6.4lf\n", englishAverage);
    printf("CProgram:%6.4lf\n", programAverage);
}

int main() {
    int n;
    scanf("%d", &n);
    struct Student students[n];
    for (int i = 0; i < n; i++) {
        InputStudent(&students[i]);
    }
    computeAverage(students, n);
    return 0;
}

没脾气了都，这回中文全部乱码，找了半天居然终端编码是GBK，手动改成utf-8没用！怎么之前就不这样呢？噢~，原来是用了最新版的vscode啊，默认编码是utf-8啊。这我找谁说理去啊！

题目四

#include <stdio.h>
#include <string.h>

// 定义学生结构体
struct Student
{
    char id[12];
    char name[11];
    int mathScore;
    int englishScore;
    int programmingScore;
    double averageScore;
};

// 输入学生信息
void InputStudent(struct Student *student)
{
    scanf("%s %s %d %d %d", student->id, student->name, &student->mathScore, &student->englishScore, &student->programmingScore);
    student->averageScore = (student->mathScore + student->englishScore + student->programmingScore) / 3.0;
}

// 输出学生信息
void OutputStudent(struct Student *student)
{
    printf("%s %6.4lf\n", student->id, student->averageScore);
}

// 选择排序
void DescendingSortByAvgscore(struct Student *students, int n)
{
    for (int i = 0; i < n - 1; i++)
    {
        for (int j = i + 1; j < n; j++)
        {
            if (students[i].averageScore < students[j].averageScore)
            {
                struct Student temp = students[i];
                students[i] = students[j];
                students[j] = temp;
            }
        }
    }
}

int main()
{
    int n;
    scanf("%d", &n);
    struct Student students[n];
    for (int i = 0; i < n; i++)
    {
        InputStudent(&students[i]);
    }
    DescendingSortByAvgscore(students, n);
    printf("根据学生成绩的平均分排序结果:\n");
    for (int i = 0; i < n; i++)
    {
        OutputStudent(&students[i]);
    }
    return 0;
}

题目五

#include <stdio.h>
#include <string.h>

// 定义学生结构体
struct Student
{
    char id[12];
    char name[11];
    int mathScore;
    int englishScore;
    int programmingScore;
    double averageScore;
};

// 输入学生信息
void InputStudent(struct Student *student)
{
    scanf("%s %s %d %d %d", student->id, student->name, &student->mathScore, &student->englishScore, &student->programmingScore);
    student->averageScore = (student->mathScore + student->englishScore + student->programmingScore) / 3.0;
}

// 输出学生信息
void OutputStudent(struct Student *student)
{
    printf("%-10s %s\n", student->name, student->id);
}

// 选择排序
void DescendingSortByName(struct Student *students, int n)
{
    for (int i = 0; i < n - 1; i++)
    {
        for (int j = i + 1; j < n; j++)
        {
            if (students[j].name[0] < students[i].name[0])
            {
                struct Student temp = students[i];
                students[i] = students[j];
                students[j] = temp;
            }
        }
    }
}

int main()
{
    
    int n;
    scanf("%d", &n);
    struct Student students[n];
    for (int i = 0; i < n; i++)
    {
        InputStudent(&students[i]);
    }
    DescendingSortByName(students, n);
    printf("根据学生姓名排序结果:\n");
    for (int i = 0; i < n; i++)
    {
        OutputStudent(&students[i]);
    }
    return 0;
}

解释:比较name数组的第一位即可