关于#c++#的问题：cout << "Open file failed" << endl

最后显示open file failed，打不开文件，求大佬

#include
#include
#include
#include
using namespace std;
file.open("C://phonebook.txt",ios::out|ios::binary);
    if (!file) {
        cout << "Open file failed" << endl;
    }
    else {
        file << "hello " << "world3";
        cout << "shuchu" << endl;
    }
    file.close();

```

文件不存在，要先新建

路径错误
改为C:/phonebook.txt