add: lesson{5,6}, CMakeLists.txt

5 files changed, 81 insertions, 0 deletions

diff --git a/src/chapter1/lesson5/cin.cpp b/src/chapter1/lesson5/cin.cpp
new file mode 100644
index 0000000..0fc25f8
--- /dev/null
+++ b/src/chapter1/lesson5/cin.cpp
@@ -0,0 +1,12 @@
+#include <iostream>  // for std::cout and std::cin
+
+int main()
+{
+    std::cout << "Enter a number: "; // ask user for a number
+
+    int x{};       // define variable x to hold user input (and value-initialize it)
+    std::cin >> x; // get number from keyboard and store it in variable x
+
+    std::cout << "You entered " << x << '\n';
+    return 0;
+}
diff --git a/src/chapter1/lesson5/multiple_cin.cpp b/src/chapter1/lesson5/multiple_cin.cpp
new file mode 100644
index 0000000..991e397
--- /dev/null
+++ b/src/chapter1/lesson5/multiple_cin.cpp
@@ -0,0 +1,14 @@
+#include <iostream>  // for std::cout and std::cin
+
+int main()
+{
+    std::cout << "Enter two numbers separated by a space: ";
+
+    int x{}; // define variable x to hold user input (and value-initialize it)
+    int y{}; // define variable y to hold user input (and value-initialize it)
+    std::cin >> x >> y; // get two numbers and store in variable x and y respectively
+
+    std::cout << "You entered " << x << " and " << y << '\n';
+
+    return 0;
+}
diff --git a/src/chapter1/lesson5/q1.cpp b/src/chapter1/lesson5/q1.cpp
new file mode 100644
index 0000000..2320bee
--- /dev/null
+++ b/src/chapter1/lesson5/q1.cpp
@@ -0,0 +1,26 @@
+#include <iostream>  // for std::cout and std::cin
+
+int main()
+{
+    std::cout << "Enter a number: "; // ask user for a number
+    int x{}; // define variable x to hold user input
+    std::cin >> x; // get number from keyboard and store it in variable x
+    std::cout << "You entered " << x << '\n';
+
+    return 0;
+}
+
+/*
+ * a) 'h' is not integer type, so x will be 0.
+ * b) all input before '.' in '3.2' is assigned to x; all the rest remains
+ *    for future extractions.
+ * c) sign character '-' is allowed, so '-3' is assigned to x
+ * d) same as variand a)
+ * e) highest acceptable value by integer type will be used if
+ *    '99999999999999999999' is input
+ * f) 123 is assigned to x and 'abc' remains for future extractions
+ * g) first character 'a' is not a valid integer type, so extraction failed
+ *    and x is 0
+ * h) spaces droped; '+' is valid character for integer type; 5 is assigned to x
+ * i) 5 is assigned to x; b6 remains for future extractions
+*/
diff --git a/src/chapter1/lesson5/q2.cpp b/src/chapter1/lesson5/q2.cpp
new file mode 100644
index 0000000..236a1be
--- /dev/null
+++ b/src/chapter1/lesson5/q2.cpp
@@ -0,0 +1,17 @@
+#include <iostream>
+
+/* This program will ask user for three numbers, store each in separate
+ * variables x, y, and z respectively and print the message with their values.
+ */
+int main() {
+	std::cout << "Enter three numbers: ";
+
+    int x{};
+    int y{};
+    int z{};
+    std::cin >> x >> y >> z;
+
+    std::cout << "You entered " << x << ", " << y << ", and " << z << ".\n";
+
+    return 0;
+}  
diff --git a/src/chapter1/lesson6/uninit_var.cpp b/src/chapter1/lesson6/uninit_var.cpp
new file mode 100644
index 0000000..603b8e0
--- /dev/null
+++ b/src/chapter1/lesson6/uninit_var.cpp
@@ -0,0 +1,12 @@
+#include <iostream>
+
+int main()
+{
+    // define an integer variable named x
+    int x; // this variable is uninitialized because we haven't given it a value
+    
+    // print the value of x to the screen
+    std::cout << x << '\n'; // who knows what we'll get, because x is uninitialized
+
+    return 0;
+}