Chapter 3. Tasks and Exercise 2.

chapter 3/exercise_2.cpp

@@ -0,0 +1,14 @@
+#include <iostream>
+
+int main()
+{
+    std::cout << "Enter a distance in miles: ";
+
+    double miles = 0;
+    std::cin >> miles;
+    std::cout << miles << " miles is " << miles*1.609 << " kilomiters.\n";
+
+    std::cin.get();
+    std::cin.get();
+    return 0;
+}

chapter 3/tasks.cpp

@@ -0,0 +1,61 @@
+#include <iostream>
+
+inline void simple_error(std::string s)
+{
+    std::cerr << "error: " << s << '\n';
+    std::cin.get();
+    exit(1);
+}
+
+int main()
+{
+    std::string username, addressee, frnd;
+    char frnd_sex {' '};
+    int addr_age = 0;
+
+    std::cout << "Enter your name please: ";
+    std::cin >> username;
+    std::cout << "Enter the name of addressee and his age please: ";
+    std::cin >> addressee >> addr_age;
+
+    if ( addr_age < 0 || addr_age > 110 )
+    {
+        simple_error("Are you kidding me?\nYes, you kidding me!!\nBye!");
+    }
+
+    std::cout << "Enter your friend name and sex: ";
+    std::cin >> frnd >> frnd_sex;
+
+    std::cout << "\nHello, dear " << addressee << "!\n"
+        << "\nNice to write you again.\n";
+    if (frnd_sex == 'm')
+    {
+        std::cout << "Today I have met our old friend, " << frnd << ". He was create a new electrocar in his workshop whith his new friends.\n"
+            << "I can ask him to call you when we meet again.\n";
+    }
+    else
+    {
+        std::cout << "Today I have met our old friend, " << frnd << ". She was create a new electrocar in her workshop whith her new friends.\n"
+            << "I can ask her to call you when we meet again.\n";
+    }
+    std::cout << "I heard you have selebrated your birthday and now you are " << addr_age << " years old.";
+    if ( addr_age == 17 )
+    {
+        std::cout << " So you can participate in polls next year!!\n";
+    }
+    else if ( addr_age < 12 )
+    {
+        std::cout << " And you would be " << addr_age+1 << " years old next year.";
+    }
+    else if ( addr_age > 70 )
+    {
+        std::cout << " I hope you wouldn't bored on pension.";
+    }
+
+    std::cout << "\n\nBest Regards\n"
+        << "____________________\n"
+        << "____________________\n"
+        << username << '\n';
+
+    return 0;
+}

chapter 3/unsafe_types_cast_2.cpp

@@ -5,9 +5,9 @@ int main()
     double d = 0;
     while (std::cin >> d)
     {
-        int i = d;
-        char c = i;
-        int i2 = c;
+        int i {d};
+        char c {i};
+        int i2 {c};
 
         std::cout << "d == " << d << '\n'
             << "i == " << i << '\n'