2

抱歉，我是 C++ 的新手，似乎无法理解读取 txt 文件和编写文件的基本概念。我有一个程序，目前只提示用户，然后在读取数据后在命令行上提供输出。但我想让它读取一个文件，并用它的输出创建一个文件

到此为止

#include <iostream>
#include <string>

using namespace std;

int main()
{

    cout << "Enter number of names \n";
    int a;
    cin >> a;
    string * namesArray = new string[a];
    for( int i=0; i<a; i++) {
        string temp;
        cin >> temp;
        namesArray[i] = temp;
    }

    for( int j=0; j<a; j++) {
        cout << "hello " << namesArray[j] << "\n";

    }
    return 0;
}

谢谢大家..

4

3 回答 3

1

这是一个读取文件的示例或这个示例写入文件以执行您所要求的操作，如果您想知道自己在做什么，<< 和 >> 运算符就像让您移动流的水阀从一边到另一边的信息，“cin”是一个“数据生成器”，从键盘，在页面的示例中，“myReadFile.open”从输入文件创建一个“数据生成器”，然后使用 > 移动该数据> 将其保存为字符串并 << 将其移动到 cout，不知道它是否有助于您了解更多 C++ 流...

于 2013-01-18T05:51:34.190 回答
1 
ifstream input;
input.open("inputfile.txt");
input >> var;  //stores the text in the file to an int or string
input.close();

ofstream output;
output.open("outputfile.txt"); //creates this output file
output << var;  //writes var to the output file
output.close();

希望有帮助

于 2013-01-18T06:43:01.417 回答
1 
#include <fstream>
#include <string>
#include <iostream>
using namespace std;
int main(){
    string fileName = "test.txt";        
    //declare a file object
    //options are:
    //ofstream for output
    //ifstream for input
    //fstream for both
    fstream myFile;
    //cannot pass a c++ string as filename so we convert it to a "c string"
    //... by calling strings c_str member function (aka method)
    //the fstream::out part opens the file for writing
    myFile.open(fileName.c_str(), fstream::out);
    //add the text to the file end the line (optional)
    myFile << "Some text" << endl;
    myFile.close();//always close your files (bad things happen otherwise)
    //open the file for reading with fstream::in
    myFile.open(fileName.c_str(), fstream::in);
    string myString;
    //get a line from a file (must be open for reading)
    getline(myFile,myString);
    myFile.close();//always close your file
    //demonstrates that it works
    cout << myString;
}
于 2013-01-18T06:57:06.357 回答