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C语言练习（31）

article 2025/1/31 13:30:06

有5个学生，每个学生有3门课程的成绩，从键盘输入以上数据（包括学号、姓名、3门课程成绩），计算出平均成绩，将原有数据和计算出的平均分数存放在磁盘文件stud中。

设5名学生的学号、姓名和3门课程成绩如下：

99101 Wang 89,98,67.5

99103 Li 60,80,90

99106 Fun 75.5,91.5,99

99110 Ling 100,50,62.5

99113 Yuan 58,68,71

在向文件stud写入数据后，应检查验证stud文件中的内容是否正确。

#include <stdio.h>
#include <stdlib.h>
#pragma warning(disable:4996)

// 定义学生结构体
typedef struct Student {
    int id;
    char name[20];
    double scores[3];
    double average;
} Student;

// 计算平均成绩
void calculateAverage(Student* s) {
    s->average = (s->scores[0] + s->scores[1] + s->scores[2]) / 3;
}

// 将学生数据写入文件
void writeToFile(Student* students, int num) {
    FILE* fp;
    fp = fopen("stud", "w");
    if (fp == NULL) {
        perror("Error opening file");
        exit(1);
    }
    for (int i = 0; i < num; i++) {
        fprintf(fp, "%d %s %.1lf %.1lf %.1lf %.2lf\n", students[i].id, students[i].name,
            students[i].scores[0], students[i].scores[1], students[i].scores[2], students[i].average);
    }
    fclose(fp);
}

// 从文件读取数据并验证
void readAndVerify() {
    FILE* fp;
    fp = fopen("stud", "r");
    if (fp == NULL) {
        perror("Error opening file");
        exit(1);
    }
    Student s;
    while (fscanf(fp, "%d %s %lf %lf %lf %lf", &s.id, s.name, &s.scores[0], &s.scores[1], &s.scores[2], &s.average) == 6) {
        double calculatedAverage = (s.scores[0] + s.scores[1] + s.scores[2]) / 3;
        if (calculatedAverage != s.average) {
            printf("Error: Incorrect average for student %s\n", s.name);
        }
        else {
            printf("Data for student %s is correct\n", s.name);
        }
    }
    fclose(fp);
}

int main() {
    Student students[5];
    // 输入学生数据
    for (int i = 0; i < 5; i++) {
        scanf_s("%d %s %lf %lf %lf", &students[i].id, students[i].name, &students[i].scores[0], &students[i].scores[1], &students[i].scores[2]);
        calculateAverage(&students[i]);
    }
    // 将数据写入文件
    writeToFile(students, 5);
    // 从文件读取并验证
    readAndVerify();
    return 0;
}