实验7

实验4

#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <stdlib.h>

int main()
{
    FILE* fp = fopen("data4.txt", "r");
    if (fp == NULL)
    {
        printf("打开文件失败！\n");
        system("pause");
        return 1;
    }
    int ch;
    int line = 0;
    int charCnt = 0;
    int isNewLine = 1;
    while ((ch = fgetc(fp)) != EOF)
    {
        if (ch == ' ' || ch == '\n' || ch == '\t')
        {
            if (ch == '\n')
            {
                line++;
                isNewLine = 1;
            }
            continue;
        }
        charCnt++;
        isNewLine = 0;
    }
    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);
    system("pause");
    return 0;
}

 实验5

#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <string.h>
#include <stdlib.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);
    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("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 passNum = 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[passNum] = st[i];
            passNum++;
        }
        else
        {
            strcpy(st[i].result, "不通过");
        }
    }
    return passNum;
}
void write(STU st[], int n) {
    FILE* fout = fopen("list_pass.txt", "w");
    if (!fout)
    {
        printf("打开写入文件失败！\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);
}

 

实验6

#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <string.h>

#define MAX_STU 80
#define NAME_LEN 30
#define CLASS_LEN 50
typedef struct {
    char id[20];
    char name[NAME_LEN];
    char cls[CLASS_LEN];
} Student;

int main()
{
    Student stu[MAX_STU];
    int flag[MAX_STU] = {0};
    Student lucky[5];
    int total = 0;
    char filename[50];
    FILE* fp = fopen("list.txt", "r");
    if (!fp)
    {
        printf("文件打开失败\n");
        system("pause");
        return 1;
    }
    while (fscanf(fp, "%s %s %[^\n]", stu[total].id, stu[total].name, stu[total].cls) != EOF)
    {
        total++;
    }
    fclose(fp);
    srand((unsigned)time(NULL));
    int count = 0;
    while (count < 5)
    {
        int r = rand() % total;
        if (flag[r] == 0)
        {
            flag[r] = 1;
            lucky[count] = stu[r];
            count++;
        }
    }
    printf("请输入保存文件名：");
    scanf("%s", filename);
    FILE* out = fopen(filename, "w");
    if (!out)
    {
        printf("文件创建失败\n");
        system("pause");
        return 1;
    }
    printf("------中奖名单------\n");
    for (int i = 0; i < 5; i++)
    {
        printf("%s %s %s\n", lucky[i].id, lucky[i].name, lucky[i].cls);
        fprintf(out, "%s %s %s\n", lucky[i].id, lucky[i].name, lucky[i].cls);
    }
    fclose(out);
    printf("保存成功！\n");
    system("pause");
    return 0;
}