实验七

任务四

源代码

#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
int main()
{
    int line = 0, ch, char_cnt = 0;
    int flag_newline = 1; 
    FILE *fp = fopen("data4.txt", "r");
    if (fp == NULL)
    {
        perror("open failed");
        return 1;
    }
    
    while ((ch = fgetc(fp)) != EOF)
    {
        
        if (isspace(ch))
        {
            if (ch == '\n' && flag_newline == 0)
            {
                line++;
                flag_newline = 1;
            }
            continue;
        }
        
        char_cnt++;
        flag_newline = 0;
    }
    
    if (flag_newline == 0) 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", char_cnt);
    system("pause");
    return 0;
}

 

结果

 

任务五

源代码

#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 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;
}


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%s\t%.2f\t\t%.2f\t\t%.2f\t%s\n", st[i].id, st[i].name,
        st[i].objective, st[i].subjective, st[i].sum, st[i].result);
}


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);
}


int process(STU st[], int n, STU st_pass[]) {
    int pass_cnt = 0;
    for(int 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[pass_cnt] = st[i];
            pass_cnt++;
        }else{
            strcpy(st[i].result, "未通过");
        }
    }
    return pass_cnt;
}


void write(STU st[], int n) {
    FILE *fout = fopen("list_pass.txt", "w");
    if(!fout){
        printf("fail to open output 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%s\t%.2f\t\t%.2f\t\t%.2f\t%s\n",
        st[i].id, st[i].name, st[i].objective, st[i].subjective, st[i].sum, st[i].result);
    }
    fclose(fout);
}

结果

 

任务六

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

#define STU_NUM 80   
#define WIN_NUM 5    
#define LINE_LEN 128 


typedef struct {
    char id[16];    
    char name[16];  
    char cls[32];   
} Student;
void sortWinner(Student win[], int n)
{
    int i, j;
    Student temp;
    for(i = 0; i < n - 1; i++)
    {
        for(j = 0; j < n - i - 1; j++)
        {
            if(strcmp(win[j].id, win[j+1].id) > 0)
            {
                temp = win[j];
                win[j] = win[j+1];
                win[j+1] = temp;
            }
        }
    }
}

int main()
{
    Student allStu[STU_NUM];
    FILE *fp = fopen("list.txt", "r");
    if(fp == NULL)
    {
        printf("无法打开list.txt文件！\n");
        return 1;
    }
    int total = 0;
    char buf[LINE_LEN];
    while(fgets(buf, LINE_LEN, fp) != NULL && total < STU_NUM)
    {
        sscanf(buf, "%s %s %s", allStu[total].id, allStu[total].name, allStu[total].cls);
        total++;
    }
    fclose(fp);
    srand((unsigned)time(NULL)); 
    int flag[STU_NUM] = {0};     
    Student winner[WIN_NUM];
    int winCnt = 0;
    while(winCnt < WIN_NUM)
    {
        int idx = rand() % total;
        if(flag[idx] == 0)
        {
            flag[idx] = 1;
            winner[winCnt++] = allStu[idx];
        }
    }

    
    sortWinner(winner, WIN_NUM);

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

    
    char fileName[32];
    time_t now = time(NULL);
    struct tm *t = localtime(&now);
    strftime(fileName, sizeof(fileName), "%Y%m%d.txt", t);
    printf("自动生成文件名：%s\n", fileName);
    
    FILE *fout = fopen(fileName, "w");
    if(fout == NULL)
    {
        printf("文件创建失败！\n");
        return 1;
    }
    for(int i = 0; i < WIN_NUM; i++)
    {
        fprintf(fout, "%s\t%s\t%s\n", winner[i].id, winner[i].name, winner[i].cls);
    }
    fclose(fout);
    printf("保存成功！\n");

    return 0;
}

结果