实验7

实验任务4

点击查看代码

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#define N 1000

int main() {
    FILE* fp;
    char s[N];
    int i = 0, n, lines = 1, feizifu = 0;

    fp = fopen("data4.txt", "r");
    if (fp == NULL) {
        printf("fail to open file to write\n");
        return 1;
    }

    while ((s[i] = fgetc(fp)) != EOF)
        ++i;

    n = i;

    for (i = 0; i < n; i++) {
        if (s[i] == '\n') lines++;
        if (s[i] == ' ' || s[i] == '\t' || s[i] == '\n') feizifu++;
    }

    printf("data4.txt统计结果：\n");
    printf("行数：\t\t%d\n", lines);
    printf("字符数（不含空白符）：\t%d", n - feizifu);
    fclose(fp);
    return 0;
}

实验任务5

点击查看代码

#define _CRT_SECURE_NO_WARNINGS
#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...\n", N);
    read(stu, N);
    printf("\n对考生成绩进行统计...\n");
    cnt = process(stu, N, stu_pass);
    printf("\n通过考试名单：\n");
    output(stu, N);
    write(stu, N);
    pass_rate = 1.0 * cnt / N;
    printf("\n本次考试通过率：%.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\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 i;
    int k = 0;
    for (i = 0; i < n; i++) {
        st[i].sum = st[i].subjective + st[i].objective;
        if (st[i].sum >= 60) {
            strcpy(st[i].result, "通过");
            st_pass[k++] = st[i];
        }
        else
            strcpy(st[i].result, "不通过");
    }
    return k;
}
void write(STU st[], int n) {
    FILE* fp;
    int i;
    fp = fopen("C:\\Users\\冯韬\\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_pass.txt", "w");
    if (!fp) {
        perror("list_pass.txt");
        return 1;
    }
    fprintf(fp, "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++) {
        if (st[i].sum >= 60)
            fprintf(fp, "%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(fp);
}

实验任务6

点击查看代码

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define N 80
#define WIN 5
struct Student {
    char id[20];
    char name[20];
    char cls[50];
};
int main() {
    struct Student stu[N];
    int x[N];
    int i, j, tmp;
    FILE* fp;
    char outFile[50];
    fp = fopen("F:\\qq\\1_gbk\\list.txt", "r");
    if (fp == NULL) {
        printf("无法打开 list.txt 文件！\n");
        return 1;
    }
 
    for (i = 0; i < N; i++) {
        fscanf(fp, "%s %s %s",
            stu[i].id, stu[i].name, stu[i].cls);
        x[i] = i;
    }
    fclose(fp);
    srand((unsigned int)time(NULL));
    for (i = N - 1; i > 0; i--) {
        j = rand() % (i + 1);
        tmp = x[i];
        x[i] = x[j];
        x[j] = tmp;
    }
    printf("------------中奖名单------------\n");
    for (i = 0; i < WIN; i++) {
        printf("%s  %s  %s\n",
            stu[x[i]].id,
            stu[x[i]].name,
            stu[x[i]].cls);
    }
    printf("\n------------保存到文件------------\n");
    printf("输入文件名：");
    scanf("%s", outFile);
 
    fp = fopen(outFile, "w");
    if (fp == NULL) {
        printf("文件创建失败！\n");
        return 1;
    }
 
    for (i = 0; i < WIN; i++) {
        fprintf(fp, "%s  %s  %s\n",
            stu[x[i]].id,
            stu[x[i]].name,
            stu[x[i]].cls);
    }
    fclose(fp);
 
    printf("保存成功！\n");
    return 0;
}