实验七

任务四

1源代码及运行截图

#include <stdio.h>
#include<stdlib.h>
int main()
{
    FILE *fp;
    char ch;
    int line = 1, charNum = 0;

    fp = fopen("C:\\Users\\LENOVO\\Downloads\\实验7数据文件及部分代码_gbk\\实验7数据文件及部分代码_gbk\\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++;
        }
        // 排除空格、回车、Tab
        if (ch != ' ' && ch != '\n' && ch != '\t')
        {
            charNum++;
        }
    }
    fclose(fp);

    printf("data4.txt统计结果:\n");
    printf("行数:\t\t\t%d\n", line);
    printf("字符数(不计空白符):\t%d\n", charNum);
    system("pause");
    return 0;
}

 任务五

#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;
}

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);
}
void read(STU st[], int n) {
    int i;
    FILE *fin;

    fin = fopen("C:\\Users\\Administrator\\Desktop\\C实验7\\实验7数据文件及部分代码_gbk\\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 i;
    int cntpass=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[cntpass++]=st[i];
          }
          else
          {
              strcpy(st[i].result,"不通过");
          }
  }
  return cntpass;
}


void write(STU st[], int n) {
   int i;
   FILE *fout=fopen("C:\\Users\\Administrator\\Desktop\\C实验7\\实验7数据文件及部分代码_gbk\\list_pass.txt","w");
   if(fout==NULL)
   {
       printf("fail to open output file\n");
       return;
   }
    for (i = 0; i < n; i++)
    {
        fprintf(fout,"%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);
    }
    fclose(fout);
}

 

任务六

1.源代码及运行截图

#define _CRT_SECURE_NO_WARNINGS  
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>
#include<stdlib.h>
#define MAX_STU 80
#define LEN_LINE 100

int main()
{

    char student[MAX_STU][LEN_LINE];
    int flag[MAX_STU] = {0};
    FILE *fp;
    char saveFile[50];
    int count = 0;
    int i, j, randNum;
    char winner[5][LEN_LINE]; 
    int winCnt = 0;            


    fp = fopen("C:\\Users\\LENOVO\\Downloads\\实验7数据文件及部分代码_gbk\\实验7数据文件及部分代码_gbk\\list.txt", "r");
    if (fp == NULL)
    {
        printf("无法打开list.txt文件！\n");
        return 1;
    }
    while (fgets(student[count], LEN_LINE, fp) != NULL && count < MAX_STU)
    {
        student[count][strcspn(student[count], "\n")] = '\0';
        count++;
    }
    fclose(fp);

    srand((unsigned int)time(NULL));
    while (winCnt < 5)
    {
        randNum = rand() % count;
        if (flag[randNum] == 0)
        {
            flag[randNum] = 1;
            strcpy(winner[winCnt], student[randNum]);
            winCnt++;
        }
    }

    printf("--------中奖名单--------\n");
    for (i = 0; i < 5; i++)
    {
        printf("%s\n", winner[i]);
    }


    printf("输入文件名：");
    scanf("%s", saveFile);

    fp = fopen(saveFile, "w");
    if (fp == NULL)
    {
        printf("文件创建失败！\n");
        return 1;
    }
    for (i = 0; i < 5; i++)
    {
        fprintf(fp, "%s\n", winner[i]);
    }
    fclose(fp);

    printf("--------保存到文件--------\n");
    printf("保存成功！\n");
    system("pause");
    return 0;
}