added solutions

Author: teseoch

Diff for: codes/solutions/06-vectors.cpp

@@ -0,0 +1,58 @@
+#include <iostream>
+#include <vector> //Don't forget to include this every time you need to use vectors
+
+int main()
+{
+
+    //Task 0: Create an empty vector V for integer elements
+    std::vector< int > V{};
+
+    //Task 1: Add the elements 6, 10, 17 to V (in that order)
+    V.push_back(6); //0
+    V.push_back(10);//1
+
+    std::cout <<"the size of V is " << V.size() << std::endl;
+
+    V.push_back(17); //2
+
+    //Task 2: Print out the size of V
+
+    std::cout <<"At the end the size is: " << V.size() << std::endl;
+    //Task 3: Print out the element at index 1 of V
+    std::cout << "The first element is " << V.at(0) << std::endl;
+    std::cout << "The last element is " << V.at(2) << std::endl;
+    size_t size{ V.size() };
+    std::cout << "Better way is " << V.at(size - 1) << std::endl;
+    //std::cout << "bla " << V.at(30) << std::endl;
+    V.push_back(333);
+    V.push_back(42);
+    //Task 4: Iterate over V and print out each element.
+    for (int value : V)
+    {
+        std::cout << "the value is " << value << std::endl;
+    }
+
+    //Task 5: Use an indexing loop (that is, a C-style for-loop) to iterate
+    //        over each index of the vector. For each index, print the index
+    //        and the element at that index.
+    //        Note that the "natural" type for an index variable is "unsigned int".
+    for (size_t i{ 0 }; i < V.size(); ++i)
+    {
+        std::cout << "the value at index " << i << " is " << V.at(i) << std::endl;
+    }
+
+    for (int i{ (int) V.size()-1}; i >= 0; --i)
+    {
+        std::cout << "the value at index " << i << " is "  << std::endl;
+    }
+
+
+    //Task 6: Add the value 187 to the end of V, then repeat steps 2-4 (by copying/pasting)
+
+     unsigned int x{ 0 };
+     std::cout << "unsigned " << x << std::endl;
+     --x;
+     std::cout << "unsigned " << x << std::endl;
+
+    return 0;
+}

Diff for: codes/solutions/07-more_vectors.cpp

@@ -0,0 +1,29 @@
+#include <iostream>
+#include <vector>
+
+int main()
+{
+    //Task 1: Create a vector W of element type float containing the sequence
+    //        10.6, 1.87, 11.1, 11.6, 4.45
+    std::vector<float> W{ 10.6, 1.87, 11.1, 11.6, 4.45 };
+
+    //Task 2: Print the contents of the vector on one line.
+    //        (Challenge exercise for later: Print commas between each element, but not after the last element)
+    for (float v : W)
+        std::cout << v << " ";
+    std::cout << std::endl;
+
+    //Task 3: Modify the element at index 1 to equal 999.
+    //        Weigh the benefits of the .at() function versus square brackets.
+    W.at(1) = 999;
+    //W[1] = 999;
+
+    for (float v : W)
+        std::cout << v << " ";
+    std::cout << std::endl;
+
+
+    //Task 4: Copy/paste the loop from task 2 to print the vector again.
+
+    return 0;
+}