如何在C ++的文件末尾添加数据？ [英] How do I add data at the end of a file in C++?

问题描述

我已经按照网上的说明，这段代码假设将输入添加到文件'数据库'的末尾。但是当我检查，数据超过现有的数据。请帮助，这里是我的代码：

I have followed instructions on the net and this code is suppose to add the inputs to the end of the file 'database'. But when i check, the data over rides the existing data. Please help, here is my code:

int main(){
    string name;
    string address;
    string handphone;
    cout << "Name: ";
    getline(cin, name);
    cout << "Address: ";
    getline(cin, address);
    cout << "Handphone Number: ";
    getline(cin, handphone);
    ofstream myfile("database", ios_base::ate);
    myfile.seekp( 0, ios_base::end );
    myfile << name<<endl;
    myfile << address<<endl;
    myfile << handphone<<endl;
    myfile.close();
}

推荐答案

Use:

ofstream myfile("database",  ios::out | ios::app);

ios :: out ：操作。

ios :: app ：所有输出操作都在文件末尾执行，当前文件的内容。此标记只能在打开的仅输出操作的流中使用。

ios::app: All output operations are performed at the end of the file, appending the content to the current content of the file. This flag can only be used in streams open for output-only operations.

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