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c語言—文件的創(chuàng)建與建立
今天要介紹的是有關(guān)文件的創(chuàng)建與讀取的語法,事實上,c語言中對于這方面的已經(jīng)有相當(dāng)經(jīng)典且應(yīng)用相當(dāng)廣泛的語法了,但是我今天想講一講關(guān)于c++中的相關(guān)語法,以下僅供參考!
以下是代碼:
首先是文件的創(chuàng)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。
# 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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