c語言文件創建與建立
C語言是一門通用計算機編程語言,應用廣泛。下面是小編分享的c語言文件創建與建立,一起來看一下吧。
今天給大家分享的是有關文件的創建與讀取的語法,事實上,c語言中對於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於c++中的相關語法,以下是代碼:
首先是文件的創建:
# include
# include
# include
using namespace std;
int main() {
ofstream outclientfile("", 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("", 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;< p="">
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;
}
知識點:以文件的創建為例,我們在頭文件中使用# include包含了ofstream類,並且在主程序中使用類ofstream建立了名為outclientfile對象,並且初始化其構造函數。要注意的是我們在while只是判斷條件的真假,而類outclientfile進行輸入數據。