实验7

task4.c

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#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <ctype.h>

int main() {
    FILE* fp;
    char ch;
    int line_count = 0;
    int char_count = 0;
    int in_new_line = 1;

    fp = fopen("data4.txt", "r");
    if (fp == NULL) {
        printf("无法打开文件\n");
        return 1;
    }

    while ((ch = fgetc(fp)) != EOF) {
        if (ch == '\n') {
            line_count++;
            in_new_line = 1;
        }
        else if (!isspace(ch)) {
            char_count++;
            in_new_line = 0;
        }
        else if (in_new_line) {
            continue;
        }
    }
    
    if (!in_new_line) {
        line_count++;
    }

    fclose(fp);
    printf("data4.txt统计结果：\n");
    printf("行数: %d\n", line_count);
    printf("字符数(不计空白符): %d\n", char_count);

    return 0;
}

task5.c

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

#define N 10

typedef struct {
    long id;          
    char name[20];    
    float objective;  
    float subjective; 
    float sum;        
    char result[10];  
} STU;

void read(STU stu[], int n);
void write(STU st[], int n);
void output(STU stu[], int n);
int process(STU stu[], int n, STU st_pass[]);

int main() {
    STU stu[N], st_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, st_pass); 

    printf("\n通过考试的名单：\n");
    output(stu, N);        

    printf("\n把通过考试的考生信息写入文件list_pass.txt...\n");
    write(st_pass, cnt);    

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

    return 0;
}

void output(STU stu[], int n) {
    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 (int i = 0; i < n; i++) {
        printf("%ld\t\t%s\t%.2f\t\t%.2f\t\t%.2f\t\t%s\n",
            stu[i].id, stu[i].name,
            stu[i].objective, stu[i].subjective,
            stu[i].sum, stu[i].result);
    }
}

void read(STU stu[], int n) {
    FILE* fin = fopen("examinee.txt", "r");
    if (!fin) {
        printf("fail to open file\n");
        return;
    }
    for (int i = 0; i < n; i++) {
        fscanf(fin, "%ld %s %f %f",
            &stu[i].id, stu[i].name,
            &stu[i].objective, &stu[i].subjective);
    }
    fclose(fin);
}

void write(STU st[], int n) {
    FILE* fout = fopen("list_pass.txt", "w");
    if (!fout) {
        printf("fail to open write file\n");
        return;
    }
    fprintf(fout, "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 (int i = 0; i < n; i++) {
        fprintf(fout, "%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);
    }
    fclose(fout);
}

int process(STU stu[], int n, STU st_pass[]) {
    int pass_cnt = 0;
    for (int i = 0; i < n; i++) {
        stu[i].sum = stu[i].objective + stu[i].subjective;
        if (stu[i].sum >= 60) {
            strcpy(stu[i].result, "通过");
            st_pass[pass_cnt++] = stu[i];
        }
        else {
            strcpy(stu[i].result, "不通过");
        }
    }
    return pass_cnt;
}

task6.c

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#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#define STUDENT_COUNT 80  
#define SELECT_COUNT 5  
#define LINE_LENGTH 50   

typedef struct {
    char id[15];      
    char name[15];    
    char classInfo[30];
} Student;

int main() {
    Student students[STUDENT_COUNT];
    FILE* fp = fopen("list.txt", "r");
    if (!fp) {
        printf("无法打开文件 list.txt\n");
        return 1;
    }
    for (int i = 0; i < STUDENT_COUNT; i++) {
        fscanf(fp, "%s %s %s",
            students[i].id,
            students[i].name,
            students[i].classInfo);
    }
    fclose(fp);

    int selected[STUDENT_COUNT] = { 0 }; 
    Student winners[SELECT_COUNT];    
    srand((unsigned int)time(NULL));  

    for (int i = 0; i < SELECT_COUNT; ) {
        int r = rand() % STUDENT_COUNT;
        if (!selected[r]) {            
            selected[r] = 1;           
            winners[i] = students[r];  
            i++;                        
        }
    }

    printf("-------------中奖名单-------------\n");
    for (int i = 0; i < SELECT_COUNT; i++) {
        printf("%s\t%s\t%s\n",
            winners[i].id,
            winners[i].name,
            winners[i].classInfo);
    }

    char filename[50];
    printf("-------------保存到文件-------------\n");
    printf("输入文件名：");
    scanf("%s", filename);

    FILE* outFp = fopen(filename, "w");
    if (!outFp) {
        printf("无法创建文件 %s\n", filename);
        return 1;
    }
    for (int i = 0; i < SELECT_COUNT; i++) {
        fprintf(outFp, "%s\t%s\t%s\n",
            winners[i].id,
            winners[i].name,
            winners[i].classInfo);
    }
    fclose(outFp);
    printf("保存成功！\n");

    return 0;
}