刪除包含一個字

Question

我試圖刪除包含從文本文件 特定字線一條線，但它不工作

void deleteline() 
{ 
    string line, deletecontact; 
    cout << "Plase enter the contact (name or number) to delete:"; 
    cin >> deletecontact; 
    ifstream file; 
    ofstream outfile; 
    file.open("data.txt"); 
    outfile.open("newM.txt"); 
    while (getline(file, line)) { 
     if (line != deletecontact) { 
      outfile << line << endl; 
     } 
    } 
    outfile.close(); 
    file.close(); 
    remove("movieList.txt"); 
    rename("newM.txt", "data.txt"); 
} 

預先感謝您

Answer 1

您只有在刪除線他們是平等的（即line != deleteContact）。如果你想刪除，正如你所說，只包含這個字線，你應該寫類似以下內容：

if (strstr(line.c_str(), deleteContact.c_str()) == nullptr) ...