实验7

任务4

源代码

#include <stdio.h>
#include<stdlib.h>
int main(){
	int ch;
	int line=0;
	int charans=0;
	int flagnewline=1;
	FILE *fp=fopen("data4.txt","r");
	if(fp==NULL){
		printf("打开文件失败!\n");
		return 0;
	}
	while((ch=fgetc(fp))!=EOF){
		if(ch=='\n'){
			line++;
			flagnewline=1;
		}
		else if(ch!=' '&&ch!='\t'&&ch!='\r'){
			charans++;
			flagnewline=0;
		}
	}
	if(!flagnewline)
		line++;
	fclose(fp);
	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",charans);
	return 0;
}

  结果截图

屏幕截图 2026-06-18 231202

 任务5

源代码

#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: 已完成\n", N);
    read(stu, N);

    printf("\n对考生成绩进行统计: 已完成\n");
    cnt = process(stu, N, stu_pass);

    printf("\n所有考生完整信息:\n");
    output(stu, N);   

    printf("\n通过考试的名单写入文件: 已完成!\n");
    write(stu_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;
}

// 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);
}

// 对考生信息进行处理:计算每位考生考试总分、结果;统计并返回通过考试的人数
int process(STU st[], int n, STU st_pass[]) {
    int passnum=0;
	int i;
	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[passnum++]=st[i];
		}
		else
			strcpy(st[i].result,"未通过");
	}
	return passnum;
}

// 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 st[], int n) {
	int i;
   FILE *fp=fopen("list_pass.txt","w");
   if(!fp){
	   printf("写入文件失败\n");
	   return;}
   fprintf(fp,"准考证号\t姓名\t\t客观题得分\t\t操作题得分\t\t总分\t\t结果\n");
   for(i=0;i<n;i++){
	   fprintf(fp,"%ld\t%12s\t%12.2f\t\t%12.2f\t\t%12.2f\t\t%12s\n",st[i].id,st[i].name,st[i].objective,st[i].subjective,st[i].sum,st[i].result);
   }
   fclose(fp);
}

  

结果截图

屏幕截图 2026-06-19 162819

屏幕截图 2026-06-19 162924

任务6

源代码

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

#define max_stu 80
#define luck_count 5

typedef struct
{
    char id[20];
    char name[30];
    char classname[50];
} stu;

stu allstu[max_stu];
int stutotal = 0;

int readstu();
void getluck(stu luck[]);
void sortluck(stu luck[]);
void savebyinput(stu luck[]);
void savebydate(stu luck[]);

int main()
{
    stu luckarr[luck_count];

    if (readstu() <= 0)
    {
        system("pause");
        return 1;
    }
    getluck(luckarr);
    sortluck(luckarr);
    savebyinput(luckarr);
    savebydate(luckarr);

    system("pause");
    return 0;
}

int readstu()
{
    FILE *fp;

    fp = fopen("list.txt", "r");
    if (fp == NULL)
    {
        printf("无法打开list.txt,请检查文件位置\n");
        return -1;
    }
    memset(allstu, 0, sizeof(allstu));
    stutotal = 0;
    while (fscanf(fp, "%s %s %s", allstu[stutotal].id, allstu[stutotal].name, allstu[stutotal].classname) == 3)
    {
        stutotal++;
        if (stutotal >= max_stu)
            break;
    }
    fclose(fp);
    printf("成功读取%d位学生信息\n", stutotal);
    return stutotal;
}

void getluck(stu luck[])
{
    int flag[max_stu] = {0};
    int i, cnt, pos;
    cnt = 0;
    srand((unsigned)time(NULL));
    while (cnt < luck_count)
    {
        pos = rand() % stutotal;
        if (flag[pos] == 0)
        {
            flag[pos] = 1;
            luck[cnt++] = allstu[pos];
        }
    }
}

void sortluck(stu luck[])
{
    int i, j;
    stu temp;
    for (i = 0; i < luck_count - 1; i++)
    {
        for (j = 0; j < luck_count - 1 - i; j++)
        {
            if (strcmp(luck[j].id, luck[j + 1].id) > 0)
            {
                temp = luck[j];
                luck[j] = luck[j + 1];
                luck[j + 1] = temp;
            }
        }
    }
}

void savebyinput(stu luck[])
{
    char filename[50];
    FILE *fp;
    int i;

    printf("\n请输入保存文件名称:");
    scanf("%s", filename);
    fp = fopen(filename, "w");
    if (fp == NULL)
    {
        printf("文件创建失败\n");
        return;
    }
    fprintf(fp, "学号\t姓名\t班级\n");
    printf("=====中奖名单=====\n");
    for (i = 0; i < luck_count; i++)
    {
        fprintf(fp, "%s\t%s\t%s\n", luck[i].id, luck[i].name, luck[i].classname);
        printf("%s\t%s\t%s\n", luck[i].id, luck[i].name, luck[i].classname);
    }
    fclose(fp);
    printf("保存成功!\n");
}

void savebydate(stu luck[])
{
    char filename[50];
    FILE *fp;
    time_t t;
    struct tm *now;
    int i;

    t = time(NULL);
    now = localtime(&t);
    strftime(filename, sizeof(filename), "%Y%m%d.txt", now);
    fp = fopen(filename, "w");
    fprintf(fp, "学号\t姓名\t班级\n");
    for (i = 0; i < luck_count; i++)
    {
        fprintf(fp, "%s\t%s\t%s\n", luck[i].id, luck[i].name, luck[i].classname);
    }
    fclose(fp);
    printf("自动生成日期文件:%s\n", filename);
}

  

结果截图

 屏幕截图 2026-06-19 172456

屏幕截图 2026-06-19 172732

 

posted @ 2026-06-20 18:22  梅雨欣  阅读(14)  评论(0)    收藏  举报