Question

谁能举几个简单的例子说说c++文件流ifstream和ofstream怎么用？

rt

Answer 1

去C++的网站，基本各个库函数的例子都有，不过需要你会英语。请看参考资料链接。
// opening and closing a file
#include <iostream>
#include <fstream>
using namespace std;
int main () {
ofstream outfile;
outfile.open ("test.txt");
// >> i/o operations here <<
outfile.close();
return 0;
}

// print the content of a text file.
#include <iostream>
#include <fstream>
using namespace std;
int main () {
ifstream infile;
infile.open ("test.txt", ifstream::in);
int ch = infile.get();
while (infile.good()) {
cout << (char) ch;
ch = infile.get();
}
infile.close();
return 0;
}

Answer 2

#include <iostream>
#include <fstream>
using namespace std;

int main () {

ifstream infile ( "input.txt" );
ofstream outfile ("output.txt");

if (infile.is_open() && outfile.is_open())
outfile << "both files are open.\n";

infile.close();
outfile.close();

return 0;
}

Answer 3

输出文件流 output file stream 用于向文件写数据（输出到文件） fstream 文件流，可以输入也可以输出，是上面两个的合体