Chapter 4. Exercises renamed to tasks.

chapter 4/task6.cpp

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+#include <iostream>
+#include <limits>
+#include <vector>
+#include <string>
+#include <algorithm>
+#include <exception>
+
+using namespace std;
+
+constexpr double m_cm = 100;
+constexpr double in_cm = 2.54;
+constexpr double ft_in = 12;
+
+void print_prompt(const vector<string> units)
+{
+    cout << "Enter the measurements please.\n"
+        << "Format: measurement unit\n "
+        << "Available units: ";
+    for ( string unit : units )
+    {
+        cout << unit << ' ';
+    }
+    cout << '\n';
+}
+
+int find_unit_index(const string& unit, const vector<string>& units)
+{
+    for ( int i : {0, 1, 2, 3} )
+    {
+        if ( unit == units[i] ) return i;
+    }
+    throw 74;
+}
+
+void convert(double& number, const int& unit_index)
+{
+    switch ( unit_index )
+    {
+        case 0:
+            break;
+        case 1:
+            number *= m_cm;
+            break;
+        case 3:
+            number *= ft_in;
+            // ACHTUNG: No break!! Now we need to convert inches to centimiters
+            // after converting feets to inches.
+        case 2:
+            number *= in_cm;
+            break;
+    }
+    return;
+}
+
+int main()
+{
+    double number;
+    double min = numeric_limits<double>::max();
+    double max = numeric_limits<double>::min();
+    double sum = 0;
+    string unit = "";
+    vector<string> units {"cm", "m", "in", "ft"};
+    vector<double> measurements;
+
+    print_prompt(units);
+
+    while ( cin >> number >> unit )
+    {
+        int unit_index = 0;
+
+        try
+        {
+            unit_index = find_unit_index(unit, units);
+        }
+        catch (const int code)
+        {
+            cout << "Exception with error code: " << code << '\n';
+            cout << "Try again:\n";
+            continue;
+        }
+
+        cout << "Entered measurement: " << number << ' ' << unit <<  '\n';
+        convert(number, unit_index);
+        sum += number;
+        measurements.push_back(number);
+
+        if ( number < min )
+        {
+            min = number;
+            cout << "Least number entered.\n";
+        }
+        if ( number > max )
+        {
+            cout << "Most number entered.\n";
+            max = number;
+        }
+
+        cout << "\nAnd the next one please:\n";
+    }
+    cout << "Least measurement: " << min << "cm.\n"
+        << "Most measurement: " << max << "cm.\n"
+        << "Sum of all " << measurements.size() << " measurements: " << sum << "cm.\n";
+
+    sort(measurements.begin(), measurements.end());
+    cout << "All measurements(in centimeters):\n";
+    for( double current : measurements )
+    {
+        cout << current << ' ';
+    }
+    cout << '\n';
+    cout << "Good bye!!\n";
+}