实验7

task7:

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

int main(){
    FILE *fp;
    int line=0;
    int str=0;
    char ch;
    fp=fopen("data4.txt","r");
    if(!fp){
        printf("fail to open file to read\n");
        return 0;
    }
    while((ch=fgetc(fp))!=EOF){
        if(ch=='\n')
            line++;
        if(ch!=' '&&ch!='\t'&&ch!='\n')
            str++;
    }
    fclose(fp);
    line++;
    printf("data4.txt统计结果:\n");
    printf("行数: %d\n", line);
    printf("字符数(不计空白符): %d\n",str);

    return 0;
}

 task5:

#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 s[], int n) {
    FILE *fp;
    int i;
    fp=fopen("list_pass.txt","w");
    if(!fp){
        printf("fail to open file to read");
        return;
    }
    for(i=0;i<n;i++){
        fprintf(fp,"%ld %s %f %f %lf %c",s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[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;
    int 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++;
        }
        else
        strcpy(st[i].result,"不通过");
    }
    return count;
}

 task6:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define N 80
#define STUDENT_NUM 10

typedef struct {
    int id;
    char name[N];
    char class[N];
} STU;


int readStudents(STU students[], int maxNum);
void drawLuckyStudents(STU students[], int studentCount, STU luckyStudents[]);
void saveLuckyList(STU luckyStudents[], int count);

int main() {
    STU stu[STUDENT_NUM];
    STU luckyStu[5];
    int studentCount;


    studentCount = readStudents(stu, STUDENT_NUM);
    if (studentCount == 0) {
        return 1;
    }

  
    srand((unsigned int)time(NULL));


    drawLuckyStudents(stu, studentCount, luckyStu);


    saveLuckyList(luckyStu, 5);

    return 0;
}


int readStudents(STU students[], int maxNum) {
    FILE *fin = fopen("list.txt", "r");
    if (fin == NULL) {
        printf("fail to open file\n");
        return 0;
    }

    int i = 0;
 
    while (i < maxNum && fscanf(fin, "%d %s %s", &students[i].id, students[i].name, students[i].class) == 3) {
        i++;
    }
    fclose(fin);
    return i;
}


void drawLuckyStudents(STU students[], int studentCount, STU luckyStudents[]) {
    int i, j, randomIndex;
    int isRepeated;
    for (i = 0; i < 5; i++) {
        do {
            isRepeated = 0;
          
            randomIndex = rand() % studentCount; 
            for (j = 0; j < i; j++) {
                if (luckyStudents[j].id == students[randomIndex].id) {
                    isRepeated = 1;
                    break;
                }
            }
        } while (isRepeated);
        luckyStudents[i] = students[randomIndex]; 
    }
}


void saveLuckyList(STU luckyStudents[], int count) {
    char fileName[N];
    FILE *fout;

    printf("------------lucky_id------------\n");
    for (int i = 0; i < count; i++) {
        printf("%d\t%s\t%s\n", luckyStudents[i].id, luckyStudents[i].name, luckyStudents[i].class);
    }

    printf("------------save to file------------\n");
    printf("input name:");
    scanf("%s", fileName);

    fout = fopen(fileName, "w");
    if (fout == NULL) {
        printf("fail open file to read\n");
        return;
    }

    for (int i = 0; i < count; i++) {
        fprintf(fout, "%d\t%s\t%s\n", luckyStudents[i].id, luckyStudents[i].name, luckyStudents[i].class);
    }
    fclose(fout);
    printf("save successfully!\n");
}