Question

唯一的问题是，当一个文件位于EOF时，程序仍会写入-或+，只需要设置一些条件，使其仅在另一个文件处于EOF时才从一个文件中提取单词。例如

prvy.txt ：Ahojte nasi studenti ktori maju radi programovanie

druhy.txt： vsetci mili

treti.txt：   + Ahojte -vsetci + nasi -mili + studenti + ktori + maju + radi + programovanie

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

int main(){
    FILE *first, *second, *third;
    char ch[256],ch1[256];
    int i=1,count=0, ch2;
    char space = ' ';
    char minus = '-';
    char plus = '+';

    first=fopen("prvy.txt", "r");
    second=fopen("druhy.txt", "r");
    third=fopen("treti.txt", "w");

    if(first==NULL || second==NULL || third==NULL)
    {
        perror("error");
        exit(1);
    }

    while (fscanf(first, "%255s", ch) == 1)
    {
        count++;
    }

    while (fscanf(second, "%255s", ch) == 1)
    {
        count++;
    }

    printf("%d",count);

    rewind(first);
    rewind(second);

    for(i;i<=count;i++)
    {
        if(i%2==1)
        {
            fputc(plus,third);
            ch2=fgetc(first);
            while(ch2 != EOF && ch2 != ' ' && ch2 != '\n') {
                putc(ch2,third);
                ch2=fgetc(first);
            }
        }
        else if(i%2==0)
        {

            fputc(minus,third);
            ch2=fgetc(second);
            while(ch2 != EOF && ch2 != ' ' && ch2 != '\n') {
                putc(ch2,third);
                ch2=fgetc(second);
            }
        }
        putc(space,third);
    }   

    fclose(first);
    fclose(second);
    fclose(third);

    return 0;
}

Answer 1

您的代码将在两个文件之间交替显示。这将不起作用，因为文件中可能包含不同数量的单词。

一种解决方案可能是在每个文件的一个变量中计算单词数。然后循环可能类似于：

<?php

    include '../koneksi.php';

    if(isset($_POST['submit_add'])){
        $nama = $_POST['nama'];
        $alamat = $_POST['alamat'];
        $kamar_id = $_POST['kamar_id'];
        $kota_id = $_POST['kota_id'];
        $sql = "INSERT INTO penghuni (nama,alamat,kamar_id,kota_id) VALUES ('$nama','$alamat','$kamar_id','$kota_id')";
        if(!$conn->query($sql))
            die('Tambah Penghuni Gagal'.$sql);
        else
            header("Location: penghuni.php");
    }

    if(isset($_POST['submit_edit'])){
        $id_old = $_POST['id_old'];
        $kamar_id = $_POST['kamar_id'];
        $kota_id = $_POST['kota_id'];
        $nama = $_POST['nama'];
        $alamat = $_POST['alamat'];
        $sql = "UPDATE penghuni SET nama='$nama', alamat='$alamat', kamar_id='$kamar_id', kota_id='$kota_id' WHERE id='$id_old'";
        if(!$conn->query($sql))
            die('Update Penghuni Gagal'.$sql);
        else
            header("Location: penghuni.php");
    }

    // $id = $_GET['id'];
    if(isset($_POST['submit_delete'])){
        $id_old = $_POST['id_old'];
        $sql = "DELETE FROM penghuni
                WHERE id='$id_old';";
        if (!$conn->query($sql))
            die('Hapus Penghuni Gagal'.$sql);
        else{
            header("Location: penghuni.php");
            exit();
        }
    }
?>

Answer 2

您无需先扫描两个文件即可计数。而是创建一个包含两个输入文件的数组，并在阅读时使用索引在两个输入文件之间切换。轮到一个文件用尽时，扫描并打印另一个文件。

这样，您就无需同时控制两个文件的成功输入：

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

int main(void)
{
    FILE *in[2];                        // Two alternating input files
    FILE *out;

    char line[80];
    char prefix[] = "+-";               // Alternating signs, +/-
    int index = 0;                      // index to in[] and prefix[]

    in[0] = fopen("1.txt", "r");
    in[1] = fopen("2.txt", "r");
    out = fopen("3.txt", "w");

    if (!(in[0] && in[1] && out)) {
        perror("fopen");
        exit(1);
    }

    while (fscanf(in[index], "%79s", line) == 1) {
        fprintf(out, "%c%s ", prefix[index], line);

        index = !index;
    }

    while (fscanf(in[!index], "%79s", line) == 1) {
        fprintf(out, "%c%s ", prefix[!index], line);
    }

    fclose(in[0]);
    fclose(in[1]);
    fclose(out);

    return 0;
}

使程序停止读取文件（如果是EOF）而仅从其他文件读取

2 个答案: