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Mention the methods of opening file within C++. Discuss.

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The methods of opening file within C++ program:

  • Opening a file using constructor
  • Opening a file using member function open() of the class.

Opening a file using constructor:
The syntax for opening file for output purpose only is

ofstream obj(“filename”);

where ofstream is a class and obj is a object of type ofstream and “filename” is any valid name of a file to be opened for output purpose only.

Example:

ofstream fout(“results.dat”);

Opening file using open():
The syntax for opening file for output purpose only 

ofstream object.open(“filename”);

where ofstream is a class and object is of ofstream class type and filename is any valid file to be opened for output purpose only.

Example:

ofstream obj;
obj.open(“text.dat”);

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