实验7

实验4

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#define N 1000

int main() {
    FILE* fp;
    char s[N];
    int i = 0, n, lines = 1, feizifu = 0;

    fp = fopen("data4.txt", "r");
    if (fp == NULL) {
        printf("fail to open file to write\n");
        return 1;
    }

    while ((s[i] = fgetc(fp)) != EOF)
        ++i;

    n = i;

    for (i = 0; i < n; i++) {
        if (s[i] == '\n') lines++;
        if (s[i] == ' ' || s[i] == '\t' || s[i] == '\n') feizifu++;
    }

    printf("data4.txt统计结果：\n");
    printf("行数：\t\t%d\n", lines);
    printf("字符数（不含空白符）：\t%d", n - feizifu);
    fclose(fp);
    return 0;
}

实验5

#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;
// 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); 
    write(stu, N); 
    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;
    }
    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) {
    int i;
    FILE* fout;
    fout = fopen("list_pass.txt", "w");
    if (!fout) {
        printf("fail to open file\n");
        return;
    }
    for (i = 0; i < n; i++)
        if(s[i].sum>=60)
            fprintf(fout, "%ld\t %s\t %f\t %f\t", s[i].id, s[i].name, s[i].objective,s[i].subjective);
    fclose(fout);

}
// 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, cnt = 0;
    float zongfen;
    for (i = 0; i < n; i++) {
        zongfen = st[i].objective + st[i].subjective;
        st[i].sum = zongfen;
        if (st[i].sum >= 60.00) {
            strcpy(st[i].result, "通过");
            st_pass[cnt++] = st[i];
        }
        else {
            strcpy(st[i].result, "不通过");
        }
    }
    return cnt;
}

 

实验6

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#define N 100
int main() {
    srand((unsigned int)time(NULL));
    char s[N][N];
    char hit[N][N];
    FILE* fin;
    FILE* fout;
    int has_hit[N] = { 0 };
    int i=0, n,lucky_i;
    char name[80];
    fin = fopen("list.txt","r");
    if (!fin) {
        perror("list.txt");
        return 1;
    }
    while (fgets(s[i], N, fin) != NULL)
        ++i;
    n = i;
    for (int j = 0; j < 5; )
    {
        lucky_i = rand() % n;
        if (has_hit[lucky_i])
            continue;
        has_hit[lucky_i] = 1;
        strcpy(hit[j], s[lucky_i]);
        ++j;

    }
    for (i = 0; i < 5; ++i) {
        printf(hit[i]);
        
    }

    printf("Enter filename:");
    gets(name);
    fout = fopen(name, "w");
    if (!fout)
    {
        perror(name);
        return 1;
    }
    for (i = 0; i < 5; ++i)
    {
        fprintf(fout, name, hit[i]);
    }
    fclose(fout);
    fclose(fin);
    return 0;


}