CODEWITHSUNDEEP
c++fstream
Miklos Gergely
Miklos Gergely

Reputation: 19

How to read words with ignoring spaces from a file in C++?

In my file every row like this:

"ID: HH-123AB, brand: Mercedes-Benz, 128000 miles, 12 L\n"

ID:, brand: miles, and L is the same in every row. Who can I scan only the HH-123AB, Mercedes-Benz, 128000 and 12?

Upvotes: 0

Views: 1343

Answers (1)

user9335240
user9335240

Reputation: 1789

You can use the following function to "tokenize" the string

vector<std::string> tokens(const std::string& csv, char separatedBy) {
    vector<std::string> tokenized;
    stringstream str(csv);
    while(!(str.fail())) {
        std::string token;
        getline(str, token, separatedBy);
        tokenized.push_back(token);
    }

    // Used std::move for performance only, you
    //   could just return it, but it will be
    //   copied
    return std::move(tokenized);
}

This function "tokenizes" a string by splitting it, using a separator character.

Then, on your main function:

std::string line;
// Get the whole line
getline(cin, line);
// Get all "comma separated tokens"
vector<std::string> commaSeparated = tokens(line, ',');

Then parse every portion of it as you want, for example:

// First space separated token in the first comma separated one
cout << tokens(commaSeparated[0], ' ')[1] << "\n";
// Second space separated token in the second comma separated one
// Note: The first space is considered one
cout << tokens(commaSeparated[1], ' ')[2] << "\n";
// First space separated token in the third comma separated one
cout << tokens(commaSeparated[2], ' ')[1] << "\n";
// First space separated token in the fourth comma separated one
cout << tokens(commaSeparated[3], ' ')[1] << "\n";

Upvotes: 2

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