实验7

实验任务4

代码

#include<stdio.h>
#define N 100

int main() {
	int line = 1, count = 0;
	FILE* fp;
	char ch;
	fp = fopen("C:\\Users\\kongj\\Downloads\\data4_20251225145355.txt", "r");
	if (!fp) {
		printf("fail to open file\n");
		return 1;
	}
	while ((ch = fgetc(fp)) != EOF) {
		if (ch == '\n')
			line++;
		else if (ch != ' ' && ch != '\t')
			count++;
	}
	
	printf("data4.txt统计结果：\n");
	printf("行数：                \t%d\n", line);
	printf("字符数（不计空白符）：\t%d\n", count);

	fclose(fp);
	return 0;
}

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实验任务5

代码

#define  _CRT_SECURE_NO_WARNINGS

#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_pass, cnt);    // 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("C:\\Users\\kongj\\Downloads\\examinee_20251225131819.txt", "r");
    if (!fin) {
        printf("fail to open file\n");
        return 1;
    }

    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* fp;
    fp = fopen("list_pass.txt", "w");
    if (!fp) {
        printf("fail to open file\n");
        return 1;
    }
    fprintf(fp, "准考证号\t姓名\t\t客观题得分\t操作题得分\t总分\t结果\n");
    for (i = 0; i < n; ++i) {
        fprintf(fp, "%ld\t%s\t\t%.2f\t%.2f\t%.2f\t%s\n",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,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");
            st_pass[count] = st[i];
            count++;
        }
        else
            strcpy(st[i].result, "不通过");
    }
    return count;
}

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实验任务6

必做

代码

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define N 100
#define M 5

int main() {
	int n, i = 0, lucky_i;
	char s[N][N], has_hit[N] = { 0 };
	char name[80], hit[M][N];
	FILE *fin,*fout;
	fin = fopen("C:\\Users\\kongj\\Downloads\\实验7数据文件及部分代码_gbk\\list.txt", "r");
	if (!fin){
		printf("fail to open file\n");
		return 1;
	}
	srand(time(NULL));
	while (fgets(s[i], N, fin) != NULL)
		i++;
	n = i;
	printf("------------中奖名单------------\n");
	for (i = 0; i < M;) {
		lucky_i = rand() % n;
		if (has_hit[lucky_i])
			continue;
		has_hit[lucky_i] = 1;
		printf("%s", s[lucky_i]);
		strcpy(hit[i], s[lucky_i]);
		++i;
	}
	printf("\n");
	printf("------------保存到文件------------\n");
	printf("输入文件名：");
	gets(name);
	fout = fopen(name, "w");
	if (!fout){
		printf("fail to open file\n");
		return 1;
	}
	for (i = 0; i < M; ++i) 
		fputs(hit[i], fout);
	printf("保存成功!\n");
	fclose(fin);
	fclose(fout);
	return 0;
}

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选做

代码

#define  _CRT_SECURE_NO_WARNINGS

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<time.h>
#define N 100
#define M 5

int main() {
	int n, i = 0, lucky_i, j;
	char s[N][N], has_hit[N] = { 0 };
	char name[80], name_time[80], hit[M][N], temp[N];
	FILE* fin, * fout;
	struct tm *time_today;
	time_t time_stamp;
	fin = fopen("C:\\Users\\kongj\\Downloads\\实验7数据文件及部分代码_gbk\\list.txt", "r");
	if (!fin){
		printf("fail to open file\n");
		return 1;
	}
	srand(time(NULL));
	while (fgets(s[i], N, fin) != NULL)
		i++;
	n = i;
	time_stamp = time(NULL);
	time_today = localtime(&time_stamp);
	sprintf(name_time, "%d%02d%02d", time_today->tm_year + 1900, time_today->tm_mon + 1, time_today->tm_mday);
	sprintf(name, "%s.txt", name_time);
	printf("------------%s中奖名单------------\n",name_time);
	for (i = 0; i < M;) {
		lucky_i = rand() % n;
		if (has_hit[lucky_i])
			continue;
		has_hit[lucky_i] = 1;
		strcpy(hit[i], s[lucky_i]);
		++i;
	}
	for (i = 0; i < M - 1; ++i) {
		for (j = i+1; j < M; ++j) {
			if (strcmp(hit[i], hit[j]) > 0) {
				strcpy(temp, hit[i]);
				strcpy(hit[i], hit[j]);
				strcpy(hit[j], temp);
			}
		}
	}
	for (i = 0; i < M; ++i)
		printf("%s", hit[i]);
	printf("\n");
	fout = fopen(name, "w");
	if (!fout){
		printf("fail to open file\n");
		return 1;
	}
	for (i = 0; i < M; ++i) 
		fputs(hit[i], fout);
	printf("文件保存成功!\n");
	fclose(fin);
	fclose(fout);
	return 0;
}

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