使用xcode处理C ++。 简单的流出来不起作用

Question

I wanted to do simple file handling test program in Xcode. But it gives me an error.

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

int main() {
    ofstream out("test");
    out<<"pen"<<"\t";
    out<<"25";
}

Error:

Implicit instantiation of undefined template std::basic_ofstream<char>

Answer 1

The first error means that you have to write fstream instead of fstream.h . The second error would be caused by the first one. Look at my g++'s output when I try to compile your example:

example.cpp:2:21: fatal error: fstream.h: No such file or directory compilation terminated.

In this link, you will find ofstream's class specification. I think it can be helpful for you:

http://www.cplusplus.com/reference/fstream/ofstream/