C++ 逐行读取并输出每一行

Question

Lets say I have a text file, and the text file contains the following:

hello world
Welcome to C++

How would I print line by line from my .txt file? For example, this is part of my code

while (getline(input, document))
{
    if (!document.empty())
    {
        if (lineisthere(document)) {
            cout << "The word" << // << "is there" << endl;
        } else {
            cout << "The word" << // << "is not there" << endl;
        }
        line++;
    }
}
input.close(); //closes the input

I want my output to look something like this:

The word Hello Word is there
However, the word Welcome to C++ is not there

Answer 1

看起来您只想使用您指定的document // ：

cout << "The word " << document << " is there" << endl;

Answer 2

Try this:

#include <iostream>
#include <fstream>
#include <string>
using namespace std;

int main () 
{
  string text;
  ifstream ifs("hello.txt");


    while(!ifs.eof()) 
    {
      getline(ifs,text);
      cout << "" << text << "\n" ;
    }

  return 0;
}

Answer 3

this code is printing text file line by line:

    #include<iostream>
#include<fstream>
#include<cstdlib>
#include<iomanip>
using namespace std;
int main()
{
string filename;
ifstream file;
    cout<<"enter file name";
    getline(cin,filename);
     filename.append(".txt");
    file.open(filename.c_str());


    string text;
    while(getline(file,text))
    {
        cout<<text<<endl;
    }
file.close();

    return 0;
}