chapter04_drill.cpp

// Chapter 04, drill

#include "../lib_files/std_lib_facilities.h"

int main()
{
    double d = 0;
    double d_conv = 0;
    double smallest = 0;
    double largest = 0;
    double sum = 0;
    vector<double> vals;
    int ctr = 0;
    string unit;
    bool is_first = true;
    bool is_valid = true;
    while (cin >> d >> unit) {
        // Convert input to metres to compare
        if (unit=="cm")
            d_conv = d/100;
        else if (unit=="m")
            d_conv = d;
        else if (unit=="in")
            d_conv = d*0.0254;
        else if (unit=="ft")
            d_conv = d*0.0254*12;
        else
            is_valid = false;
        if (is_valid) {
            cout << d << ' ' << unit;
            if (d_conv < smallest || is_first) {
                smallest = d_conv;
                cout << " the smallest so far";
            }
            if (d_conv > largest || is_first) {
                largest = d_conv;
                cout << " the largest so far";
            }
            vals.push_back(d_conv);
            sum += d_conv;
            ++ctr;
            is_first = false;
        }
        else
            cout << "invalid unit";
        cout << endl;
        is_valid = true;
    }
    cout << "smallest value: " << smallest << " m\n";
    cout << "largest value: " << largest << " m\n";
    cout << "number of values: " << ctr << endl;
    cout << "sum of values: " << sum << " m\n";
    sort(vals.begin(), vals.end());
    cout << "values:" << endl;
    for (int i = 0; i<vals.size(); ++i)
        cout << vals[i] << " m\n";
    return 0;
}