实验七

实验任务4

task4.c源代码

#include <stdio.h>

int main()
{
    FILE *fp;
    char ch;
    int line = 0;    
    int charCnt = 0; 
    
    fp = fopen("data4.txt", "r");
    if (fp == NULL)
    {
        printf("文件打开失败！\n");
        return 1;
    }

    
    while ((ch = fgetc(fp)) != EOF)
    {
       
        if (ch == '\n')
        {
            line++;
        }
       
        else if (ch != ' ' && ch != '\t')
        {
            charCnt++;
        }
    }

   
    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", charCnt);

    return 0;
}

实验任务5

task5.c源代码

#include <stdio.h>
#include <string.h>
#include <stdlib.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);
    system("pause");
    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);
}

int process(STU st[], int n, STU st_pass[]){
    int pass_cnt = 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[pass_cnt] = st[i];
            pass_cnt++;
         }
         else
         {
             strcpy(st[i].result,"未通过");
         }
     }
     return pass_cnt;
}
 void write(STU st[], int n)
 {
     int i;
     FILE *fp = fopen("list_pass.txt","w");
    fprintf(fp,"%-10s%-10s%-12s%-12s%-10s%s\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++)
     {
         fprintf(fp,"%-10ld%-10s%-12.2f%-12.2f%-10.2f%s\n",
         st[i].id,st[i].name,st[i].objective,st[i].subjective,st[i].sum,st[i].result);
     }
     fclose(fp);
    getchar();
     getchar();
 }

 

实验任务6

task6.c源代码

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

#define MAX_STU 80  

#define DRAW_NUM 5  


typedef struct {
    char id[20];
    char name[20];
    char cls[30];
} Student;

int main()
{
    FILE *fpIn, *fpOut;
    Student stu[MAX_STU];
    int flag[MAX_STU] = {0}; 
    int total = 0, i, j, randIdx, count = 0;

   
    fpIn = fopen("list.txt", "r");
    if(fpIn == NULL){
        printf("打开名单文件失败！\n");
        return 1;
    }
    while(fscanf(fpIn, "%s %s %s", stu[total].id, stu[total].name, stu[total].cls) != EOF){
        total++;
    }
    fclose(fpIn);

    
    srand((unsigned)time(NULL)); 
    printf("----------------中奖名单----------------\n");
    while(count < DRAW_NUM){
        randIdx = rand() % total;
        if(flag[randIdx] == 0){ 
            flag[randIdx] = 1;
            printf("%s %s %s\n", stu[randIdx].id, stu[randIdx].name, stu[randIdx].cls);
            count++;
        }
    }

    
    fpOut = fopen("20260615.txt", "w");
    for(i = 0; i < total; i++){
        if(flag[i] == 1){
            fprintf(fpOut, "%s %s %s\n", stu[i].id, stu[i].name, stu[i].cls);
        }
    }
    fclose(fpOut);
    printf("-----------------------------------------\n");
    printf("保存到文件\n");
    printf("保存文件名:20260615.txt\n");

    return 0;
}