Strtok 问题 C（EOF 字符？）

发布于 2024-12-23 16:13:21 字数 788 浏览 0 评论 0原文

我试图编写的代码应该从 txt 文件中读取文本并分成字符串。我得到以下代码：

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(){
    FILE *fp;
    int i=0;
    char *words=NULL,*word=NULL,c;
    if ((fp=fopen("monologue.txt","r"))==NULL){ /*Where monologue txt is a normal file with plain text*/
        printf("Error Opening File\n");
        exit(1);}
    while ((c = fgetc(fp))!= EOF){
        if (c=='\n'){ c = ' '; }
        words = (char *)realloc(words, ++i*sizeof(char));
        words[i-1]=c;}
    word=strtok(words," ");
    while(word!= NULL){
        printf("%s\n",word);
        word = strtok(NULL," ");}
    exit(0);
}

问题是我得到的输出不仅是文本（现在作为单独的字符串），而且还有一些字符 \r（这是回车符），而且还有 \241\r\002我不知道它们是什么？你能帮我一下吗？

原文

the code that i am trying to write is supposed to read text from a txt file and separate into strings. I have come to the following code:

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int main(){
    FILE *fp;
    int i=0;
    char *words=NULL,*word=NULL,c;
    if ((fp=fopen("monologue.txt","r"))==NULL){ /*Where monologue txt is a normal file with plain text*/
        printf("Error Opening File\n");
        exit(1);}
    while ((c = fgetc(fp))!= EOF){
        if (c=='\n'){ c = ' '; }
        words = (char *)realloc(words, ++i*sizeof(char));
        words[i-1]=c;}
    word=strtok(words," ");
    while(word!= NULL){
        printf("%s\n",word);
        word = strtok(NULL," ");}
    exit(0);
}

The problem is that the output that i get is not only the text (now as separate strings) but also some characters that are \r(which is carriage return) but also \241\r\002 that i cant find out what they are? Can you help me out?

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何以笙箫默 2024-12-30 16:13:21

主要问题是您永远不会在构建的字符串末尾放置空终止符。

更改：

    while ((c = fgetc(fp))!= EOF){
        if (c=='\n'){ c = ' '; }
        words = (char *)realloc(words, ++i*sizeof(char));
        words[i-1]=c;}
    word=strtok(words," ");

至：

    while ((c = fgetc(fp))!= EOF){
        if (c=='\n'){ c = ' '; }
        ++i;
        words = (char *)realloc(words, i + 1);
        words[i-1]=c;}
    words[i] = '\0';
    word=strtok(words," ");

The main problem is that you never place a null terminator at the end of the string you build up.

Change:

    while ((c = fgetc(fp))!= EOF){
        if (c=='\n'){ c = ' '; }
        words = (char *)realloc(words, ++i*sizeof(char));
        words[i-1]=c;}
    word=strtok(words," ");

To:

    while ((c = fgetc(fp))!= EOF){
        if (c=='\n'){ c = ' '; }
        ++i;
        words = (char *)realloc(words, i + 1);
        words[i-1]=c;}
    words[i] = '\0';
    word=strtok(words," ");

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