c++ 文件写入与读取

#include <iostream>
#include <fstream>
#include <string>

using namespace std;

void output(string &filename)
{
    cout << "写入" << endl;
    ofstream outputFile(filename);

    if (!outputFile)
    {
        cout << "error open file:" << filename << endl; return;
    }

    outputFile << "输入内容\n";//给文件里面输入内容
    outputFile.close();

    ofstream outputFile1(filename, std::ios::app);
    outputFile1 << "追加内容";
    outputFile1.close();
}

void input(string& filename)
{
    ifstream inputFile(filename);
    if (!inputFile)
    {
        cout << "error open file:" << filename << endl;
    }

    string content;

    getline(inputFile, content);
    cout << content << endl;

    char con[256];
    inputFile.getline(con, 256);
    cout << con << endl;
    inputFile.close();

}


int main()
{
    string filename = "a.txt";
    output(filename);

    string inFilename = "b.txt";
    input(inFilename);
    system("pause");

    return 0;
}