实验7

四

#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>


int count();
int countChars();

int main()
{
    int linecount = 0;
    int charcount = 0;
    printf("data4.txt统计结果：\n");

    linecount = count();
    charcount = countChars();
    printf("行数:                 %d\n", linecount);
    printf("字符数(不计空白符):   %d\n",charcount);

    return 0;
}

int count()
{
    int line_count = 0;
    int char_count = 0;
    int c;

    FILE* fp = fopen("data4.txt", "r");
    if (!fp)
    {
        printf("fail to open file to read\n");
        return line_count;
    }

    while ((c = fgetc(fp)) != EOF) 
    {
        if (c == '\n') {
            line_count++;
        }
    }

    line_count++;

    fclose(fp);
    return line_count;

}
int countChars()
{
    int char_count = 0;
    int c;

    FILE* fp = fopen("data4.txt", "r");
    if (!fp)
    {
        printf("fail to open file to read\n");
        return char_count;
    }

    while ((c = fgetc(fp)) != EOF)
    {
        if (c != '\n' && c != ' ' && c != '\t')
        {
            char_count++;
        }
    }

    fclose(fp);
    return char_count;
}

五

#define _CRT_SECURE_NO_WARNINGS 1
#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;
}
// 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);
}

// 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, j = 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");
            st_pass[j] = st[i];
            j++;
        }
        else {
            strcpy(st[i].result, "不通过");
        }
    }

    return st[i].sum, st[i].result,j;
}

// 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);
}

// 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) {
    int i;
    FILE* fp;
    fp = fopen("list_pass.txt", "w");
    if (fp == NULL) {
        printf("fail to open file to write\n");
        return;
    }
    fprintf(fp, "%-10s %-8s %-10s %-10s %-10s %-8s\n", "准考证号", "姓名", "客观题得分", "操作题得分", "总分", "结果");
    for (i = 0; i < n; i++) {
        if (s[i].sum >= 60)
            fprintf(fp, "%-10ld %-8s %-10.2f %-10.2f %-10.2f %-8s\n", s[i].id, s[i].name, s[i].objective, s[i].subjective, s[i].sum, s[i].result);
    }
    fclose(fp);
}

 

 

六

#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#define N 80

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


int main()
{
    STU st[N], lucky[5];
    int i=0,number;
    int lucky_index;
    int flag[N] = { 0 };
    char filename[N];

    FILE* fp1;

    fp1 = fopen("list.txt", "r");
    if (fp1 == NULL)
    {
        printf("fail to open file to read\n");
        return 1;
    }
    while (!feof(fp1)) 
    {
        number = fscanf(fp1, "%s%s%s", st[i].id, st[i].name, st[i].classnum);
        if (number != 3)
            break;
        i++;
    }
    
    fclose(fp1);
    
    printf("------------中奖名单------------\n");

    srand(time(NULL));
    for (i = 0; i < 5; ++i)
    {
        lucky_index = rand() % N;
        if (flag[lucky_index] == 0)
        {
            lucky[i] = st[lucky_index];
            printf("%-10s%-20s%-20s\n", st[lucky_index].id, st[lucky_index].name, st[lucky_index].classnum);
            flag[lucky_index] = 1;
        }
        else
            i--;
    }
    printf("------------保存到文件------------\n");
    printf("输入文件名：");
    scanf("%s", filename);

    FILE* fp;
    fp = fopen(filename, "wb");
    if (fp == NULL)
    {
        printf("fail to open file to read\n");
        return 1;
    }
    for (i = 0; i < 5; i++)
    {
        fprintf(fp, "%-10s%-20s%-20s\n", lucky[i].id, lucky[i].name, lucky[i].classnum);
    }
    fclose(fp);
    printf("保存成功\n");

    return 0;
}