Using C++ ifstream extraction operator>> to read formatted data from a file

Question

As my learning, I am trying to use c++ ifstream and its operator>> to read data from a text file using code below. The text file outdummy.txt has following contents:

Answer 1

You can read file contents and use a Finite State Machine for parsing.

Example:

void Parse(const char* buffer, size_t length);
size_t GetBufferSize();

size_t bufferSize = GetBufferSize();
char* buffer = new char[bufferSize];

std::ifstream in("input.txt");
while(in.getline(buffer, bufferSize)) {
    Parse(buffer, in.gcount());
}

Alternatively, you can use a tool like Flex to write your parser.