C++从文本文件读取到数组/字符串

Question

这是我到目前为止的代码.

我需要做的是从两个不同的文本文件,矩阵A和矩阵B中读取.

我可以这样做但是对于我读过的每个文本文件矩阵,它只能得到它

1 0 0 

(所以基本上是第一行)实际上是Matrix A的整个文本文件

1 0 0
2 0 0
3 0 0

那么有谁知道我怎么做到这一点？

谢谢!

#include <iostream>  //declaring variables
#include <iomanip>
#include <string>
#include <fstream>

using namespace std;
string code(string& line);
int main()
{
    ofstream outf;
    ifstream myfile;
    string infile;
    string line;
    string outfile;

    cout << "Please enter an input file (A.txt) for Matrix A or (B.txt) for Matrix B" << endl;
    cin >> infile;   //prompts user for input file

    if (infile == "A.txt")
    {      //read whats in it and write to screen
        myfile.open("A.txt");
        cout << endl;
        getline (myfile, line);
        cout << line << endl;

    }
    else
        if (infile == "B.txt")
        {
            myfile.open("B.txt");
            cout << endl;
            getline (myfile, line);
            cout << line << endl;
        }
        else
    { 
        cout << "Unable to open file." << endl;
    }
        //{
            //while("Choose next operation");
        //}
    return 0;
}

Answer 1

好吧,getline显然得到一条线.

你应该逐行阅读,直到文件结束,你可以用,例如:

while (getline(myfile, line))
    out << line << endl;

这意味着:虽然有一行从myfile获取,但将该行写入输出流.