c++入门之输出文件流ofstream

 1 # include "iostream"
 2 # include"fstream"
 3 int main()
 4 {
 5     using namespace std;
 6 
 7     char automobile[50];
 8     int year;
 9     double a_price;
10     double d_price;
11 
12     ofstream outfile;
13     outfile.open("C:/Users/kb409/Desktop/carinfo.txt");//注意,这里使用"/"而不是"\"
14     //outfile.open("carinfo.txt");
15     cout << "Enter the make and model of automobile:";
16     cin.getline(automobile, 50);
17     cout << "Enter the model year:";
18     cin >> year;
19     cout << "Enter the original asking price:";
20     cin >> a_price;
21     d_price = 0.913*a_price;
22 
23     cout << fixed;//cout<<fixed是以一般格式而不是科学计数法输出浮点数
24     cout.precision(4);//控制输出流显示浮点数的数字个数
25     cout.setf(ios_base::showpoint);//显示最后一位小数后面的0;
26     cout << "Make and model:" << automobile << endl;
27     cout << "Year:" << year << endl;
28     cout << "Was asking ‘s" << a_price << endl;
29     cout << "Now asking ‘s" << d_price << endl;
30     ////////////////////////////////
31     outfile << fixed;//fixed未被定义，那么这里fix是什么?
32     outfile.precision(2);
33     outfile.setf(ios_base::showpoint);
34     outfile << "Make and model:" << automobile << endl;
35     outfile << "Year:" << year << endl;
36     outfile << "Was asking ‘s" << a_price << endl;
37     outfile << "Now asking ‘s" << d_price << endl;
38     outfile.close();
39     system("pause");
40     return 0; 
41 }