Question

对不起，我很抱歉。这是经过测试和重现的。

我正在尝试让 cout 在fstream中循环工作，同时检测每个字符的解析，但它表现出一种奇怪的行为，文本被第一个变量覆盖，我是试图投入cout。

main.cxx

#include <string.h>
#include <fstream>
#include <iostream>
#include <stdio.h>

using std::string;
using std::fstream;
using std::noskipws;
using std::cout;

int main(int argc, const char *argv[]){

    char pipe;
    string word; // stores the word of characters it's working on at the moment
    string filename = "Directory.dat";
    int type = 0; // 2 types counter, starts at 0
    int newindicator = 0; // for detecting a new * for the data set
    fstream fin(filename.c_str(), fstream::in);
    while(fin >> noskipws >> pipe){
        if(pipe == '*'){ // if the character is an asterisk
            type++;
            newindicator = 0;
            word.clear();
        }else if (pipe == '\n'){ // if the character is next line
            if(newindicator == 0){ // tells the reader to know that it just finished reading a *, so it doesn't print anything.
                newindicator = 1;
            }else {
                if(type == 1){ 
                    cout << "new word as: ";
                    cout << word << "\n";

                }else if (type == 2){ 
                    cout << "new word as: ";
                    cout << word << "\n";
                }
                word.clear(); // clears the word string as it's reading the next line.
            }
        }else{
            word+=pipe;
        }
    }
    return 0;
}

Directory.dat

*
Chan
Johnathan
Joespeh
*
Betty
Lady Gaga

输出

Chanword as:
new word as: Johnathan
new word as: Joespeh
Bettyord as:
new word as: Lady Gaga

请注意，“Chan”如何覆盖第一行的“new”字符，但之后就好了。这似乎发生在我正在做的每一种新类型上，当它召回一组新的类型时。与下一组中的Betty相同，在该cout上用“Betty”覆盖“new w”。

任何反馈都会非常感激。谢谢！

Answer 1

我怀疑你的输入文件有Windows行结尾。它们包含在Unix上以不同方式处理的回车符。

https://superuser.com/questions/374028/how-are-n-and-r-handled-differently-on-linux-and-windows

Answer 2

感谢大家的意见和反馈。根据建议做出改变：

<强>校正的

#include <string.h>
#include <fstream>
#include <iostream>
#include <stdio.h>


using std::string;
using std::fstream;
using std::noskipws;
using std::cout;

int main(int argc, const char *argv[]){

    char pipe;
    string word; // stores the word of characters it's working on at the moment
    string filename = "Directory.dat";
    int type = 0; // 2 types counter, starts at 0
    int newindicator = 0; // for detecting a new * for the data set
    fstream fin(filename.c_str(), fstream::in);
    while(fin >> noskipws >> pipe){
        if(pipe == '*'){ // if the character is an asterisk
            type++;
            newindicator = 0;
            word.clear();
        }else if (pipe == '\n'){ // if the character is next line
            if(newindicator == 0){ // tells the reader to know that it just finished reading a *, so it doesn't print anything.
                newindicator = 1;
            }else {
                if(type == 1){ 
                    cout << "new word as: ";
                    cout << word << "\n";

                }else if (type == 2){ 
                    cout << "new word as: ";
                    cout << word << "\n";
                }
                word.clear(); // clears the word string as it's reading the next line.
            }
        }else{
            if (pipe != '\r'){
                word+=pipe;
            }
        }
    }
    return 0;
}

<强>输出

new word as: Chan
new word as: Johnathan
new word as: Joespeh
new word as: Betty
new word as: Lady Gaga

奇怪的Cout行为

2 个答案: