read flot value

[Avijit]

how to read float valu from file like getw function used to read integer data. help plz. thanx

[ne555]

man getw wrote:

reads a word (that is, an int) from stream. It's provided for compatibility with SVr4. We recommend you use fread(3) instead.

[Smac89]

in C:

fscanf(FILE *object, "%f", &float_variable);

fgets(buffer, sizeof buffer, FILE *object);
sscanf(buffer, "%f", &float_variable);

scanf("%f", &float_variable);

in C++:

fstream_obj >> float_variable;

getline(cin, string_obj);
istringstream iss(string_obj);
iss >> float_variable

cin >> float_variable;

Or you can even whip up your own since c++ provides you with that option\

C++11:

// Something I used in one of AI projects

class scanFields
{

    template<typename F>
    bool get(F &first) {
        return (cin >> first).good();
    }

    template<typename F, typename... T>
    bool get(F &first, T&... values) {
         return (cin >> first).good() && get(values...);
    }

public:

    template <typename... T>
    scanFields(const string message, T&... values) {
        while (cout << message && !get(values...)) {
            cin.clear();
            cin.ignore(numeric_limits<streamsize>::max(), '\n');
        }
    }

};

Usage:

int main()
{
    float f;
    scanFields("Enter a float: ", f);
    cout << "You entered " << f << endl;
    return 0;
}