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  1. C語言

    c語言—文件的創建與建立

    時間:2025-01-12 06:57:54 C語言 我要投稿

    c語言—文件的創建與建立

      今天要介紹的是有關文件的創建與讀取的語法,事實上,c語言中對于這方面的已經有相當經典且應用相當廣泛的語法了,但是我今天想講一講關于c++中的相關語法,以下僅供參考!

      以下是代碼:

      首先是文件的創建:

      # include

      # include

      # include

      using namespace std;

      int main() {

      ofstream outclientfile("clients.dat", ios::out);

      if (!outclientfile) {

      cerr << "file could not be opend" << endl;

      exit(1);

      }

      cout << "enter the account,name,and balance." << endl;

      cout<< "enter end-of-file to end input. ?";

      int account;

      char name[30];

      double balance;

      while (cin >> account >> name >> balance) {

      outclientfile << account << " " << name << " " << balance << endl;

      cout << "?";

      }

      system("pause");

      return 0;

      }

      以下是文件的讀取:

      # include

      # include

      # include

      # include

      # include

      using namespace std;

      void outputline(int, const string, double);

      int main() {

      ifstream inclientfile("clients.dat", ios::in);

      if (!inclientfile) {

      cerr << "file could not be opened" << endl;

      exit(1);

      }

      int account;

      char name[30];

      double balance;

      cout << left << setw(10) << "account" << setw(13) << "name"

      << "balance" << endl<<fixed<<showpoint;

      while (inclientfile >> account >> name >> balance) {

      outputline(account, name, balance);

      }

      system("pause");

      return 0;

      }

      void outputline(int account, const string name, double balance) {

      cout << left << setw(10) << account << setw(13) << name

      << setw(7) << setprecision(2) << right << balance << endl;

      }

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