实验七

task4.c

#include <stdio.h>
int hangshu();
int zifushu();
int main() {
    printf("data4.txt统计结果:\n");
    printf("行数：%d\n",hangshu());
    printf("字符数(不包括空格):%d\n",zifushu());
    return 0;
    }
int hangshu() {
    FILE *fp;
    fp = fopen("C:/Users/金天/Desktop/vscode/实验7数据文件及部分代码/data4.txt","r");
    if(!fp) {
        printf("文件打开失败！\n");
        return 0;
    }
    int count = 0;
    char ch;
    while ((ch = getc(fp))!= EOF) {
        if (ch == '\n') {
            count++;
        }
    }
    fclose(fp);
    return count+=1;
}
int zifushu() {
    FILE *fp;
    fp = fopen("C:/Users/金天/Desktop/vscode/实验7数据文件及部分代码/data4.txt","r");
    if(!fp) {
        printf("文件打开失败！\n");
        return 0;
    }
    int count = 0;
    char ch;
    while ((ch = getc(fp))!= EOF) {
        if (ch!=' '&&ch!='\n') {
            count++;
        }
    }
    fclose(fp);
    return count;
}

 task5.c

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

#define N 10

typedef struct {
    long id;            // 准考证号
    char name[20];      // 姓名
    float objective;    // 客观题得分
    float subjective;   // 操作题得分
    float sum;          // 总分
    char result[10];    // 考试结果
} STU;

// 函数声明
void read(STU st[], int n);
void write(STU st[], int n);
void output(STU st[], int n);
int process(STU st[], int n, STU st_pass[]);

int main() {
    STU stu[N], stu_pass[N];
    int cnt;
    double pass_rate;

    printf("从文件读入%d个考生信息...\n", N);
    read(stu, N);

    printf("\n对考生成绩进行统计...\n");
    cnt = process(stu, N, stu_pass);

    printf("\n通过考试的名单:\n");
    output(stu, N);   // 输出所有考生完整信息到屏幕
    write(stu, N);    // 输出考试通过的考生信息到文件

    pass_rate = 1.0 * cnt / N;
    printf("\n本次等级考试通过率: %.2f%%\n", pass_rate*100);

    return 0;
}

// 把所有考生完整信息输出到屏幕上
// 准考证号，姓名，客观题得分，操作题得分，总分，结果
void output(STU st[], int n) {
    int i;
    
    printf("准考证号\t姓名\t客观题得分\t操作题得分\t总分\t\t结果\n");
    for (i = 0; i < n; i++)
        printf("%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n", st[i].id, st[i].name, st[i].objective, st[i].subjective, st[i].sum, st[i].result);
}

// 从文本文件examinee.txt读入考生信息:准考证号，姓名，客观题得分，操作题得分
void read(STU st[], int n) {
    int i;
    FILE *fin;

    fin = fopen("examinee.txt", "r");
    if (!fin) {
        printf("fail to open file\n");
        return;
    }

    while (!feof(fin)) {
        for (i = 0; i < n; i++)
            fscanf(fin, "%ld %s %f %f", &st[i].id, st[i].name, &st[i].objective, &st[i].subjective);
    }

    fclose(fin);
}

// 把通过考试的考生完整信息写入文件list_pass.txt
// 准考证号，姓名，客观题得分，操作题得分，总分，结果
void write(STU st[], int n) {
    int i, count = 0;
    FILE*fp;
    fp=fopen("list_pass.txt","w");
    if(fp==NULL)
    { 
        printf("fail to open file\n");
        return;
    }
    for(i=0;i<n;i++)
    {
        if(st[i].sum>=60)
        {
            count++;
            fprintf(fp,"%ld %s %.2f %.2f %.2f %s\n",st[i].id,st[i].name,st[i].objective,st[i].subjective,st[i].sum,st[i].result);
            }
            }
            fclose(fp);
}
// 对考生信息进行处理：计算每位考生考试总分、结果；统计考试通过的人数
int process(STU st[], int n, STU st_pass[]) {
    int i,count=0;
    for (i = 0; i < n; i++) {
        st[i].sum = st[i].objective + st[i].subjective;
        if (st[i].sum >= 60) {
            strcpy(st[i].result, "通过");
            count++;
            st_pass[count-1]=st[i];
        } else {
            strcpy(st[i].result, "不通过");
        }
    }
    return count;

}

 

 task7.c

#include <stdio.h>
#include <time.h>
#include <stdlib.h>

struct student {
    long long xuehao;
    char name[12];
    char banji[24];
};

int main() {
    FILE* fp;
    struct student STU[80];
    int total_students = 0;
    fp = fopen("list.txt", "r");
    if (fp == NULL) {
        printf("文件打开失败！");
        return 0;
    }
    while (total_students < 80 && fscanf(fp, "%lld %s %s", &STU[total_students].xuehao, STU[total_students].name, STU[total_students].banji) != EOF) {
        total_students++;
    }
    fclose(fp);

    srand(time(NULL));
    int num[5];
    int count = 0;
    struct student chu[5];
    while (count < 5) {
        int temp = rand() % total_students;
        int flag = 0;
        for (int i = 0; i < count; i++) {
            if (temp == num[i]) {
                flag = 1;
                break;
            }
        }
        if (flag == 0) {
            num[count] = temp;
            chu[count] = STU[temp];
            count++;
        }
    }

    printf("抽取的学生信息如下：\n");
    for (int i = 0; i < 5; i++) {
        printf("%lld %s %s\n", chu[i].xuehao, chu[i].name, chu[i].banji);
    }

    char filename[100];
    printf("请输入文件名：");
    scanf("%99s", filename); 
    fp = fopen(filename, "w");
    if (fp == NULL) {
        printf("文件打开失败！");
        return 0;
    }
    for (int i = 0; i < 5; i++) {
        fprintf(fp, "%lld %s %s\n", chu[i].xuehao, chu[i].name, chu[i].banji);
    }
    fclose(fp);
    return 0;
}