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--- cplusplus:selection_examples [2013/02/03 01:57] – created mithat
+++ cplusplus:selection_examples [2013/02/11 01:00] (current) – [switch] mithat
@@ Line 3: / Line 3: @@
 ===== if =====
-<file c++ if_example.cpp>#include <iostream>
+<file c++ if_example.cpp>/* Using if statements */
+#include <iostream>
 using namespace std;
@@ Line 14: / Line 15: @@
     if (grade > 60)
-        cout << "Passed!" << endl;
+        cout << "Passed" << endl;
     return 0;
@@ Line 21: / Line 22: @@
 ===== if/else =====
+<file c++ if_else_example.cpp>/* Using if/else statements */
+#include <iostream>
+using namespace std;
+int main()
+{
+    int num1;
+    cout << "Enter an integer, and I will tell you ";
+    cout << "if the number is positive: ";
+    cin >> num1;  // read an integer
+    if (num1 > 0)
+        cout << num1 << " is positive. "<< endl;
+    else
+        cout << num1 << " is not positive. "<< endl;
+    return 0;
+}</file>
+===== nested if/else =====
+<file c++ nested_if_else_example.cpp>/* Using nested if/else statements */
+#include <iostream>
+using namespace std;
+int main()
+{
+    int grade;
+    cout << "Enter a numerical grade, and I will tell you" << endl;
+    cout << "how well the student performed: ";
+    cin >> grade;    // read an integer
+    cout << "The student received a letter grade of ";
+    if (grade >= 90 )
+        cout << "A";
+    else if (grade >= 80)
+        cout << "B";
+    else if (grade >= 70)
+        cout << "C";
+    else if (grade >= 60)
+        cout << "D";
+    else
+        cout << "F";
+    cout << "." << endl;
+    return 0;
+}
+</file>
+===== validating input =====
+<file c++ validating_input_example.cpp>/* Using logical operators to validate input */
+#include <iostream>
+using namespace std;
+int main()
+{
+    int grade;
+    cout << "Enter a numerical grade, and I will tell you" << endl;
+    cout << "how well the student performed: ";
+    cin >> grade;    // read an integer
+    if (grade >= 0 && grade <= 100)
+    {
+        cout << "The student received a letter grade of ";
+        if (grade >= 90 )
+            cout << "A";
+        else if (grade >= 80)
+            cout << "B";
+        else if (grade >= 70)
+            cout << "C";
+        else if (grade >= 60)
+            cout << "D";
+        else
+            cout << "F";
+        cout << "." << endl;
+    }
+    else
+        cout << "The grade must be between 0 and 100." << endl;
+    return 0;
+}</file>
+===== comparing characters =====
+<file c++ comparing_characters.cpp>/* Comparing characters */
+#include <iostream>
+using namespace std;
+int main()
+{
+   char ch;
+   // Get a character from the user.
+   cout << "Enter a letter: ";
+   ch = cin.get();
+   // Did user enter a letter?
+   if (ch >= 'a' && ch <= 'z')
+      cout << "You entered a character between 'a' and 'z'." << endl;
+   else
+      cout << "You entered something else." << endl;
+   return 0;
+}</file>
+===== switch =====
+<file c++ simple_switch_example.cpp>/* A simple switch statement example */
+#include <iostream>
+using namespace std;
+int main()
+{
+    int selection;
+    // Prompt the user for a selection:
+    cout << "Enter:" << endl
+         << "1 for a foo" << endl
+         << "2 for a bar" << endl
+         << "3 for a baz" << endl
+         << "> ";
+    cin >> selection;
+    // Give the user what they asked for:
+    switch (selection)
+    {
+    case 1:
+        cout << "You entered 1." << endl;
+        cout << "A foo on all your houses!" << endl;
+        break;
+    case 2:
+        cout << "You entered 2." << endl;
+        cout << "A bar on all your houses!" << endl;
+        break;
+    case 3:
+        cout << "You entered 3." << endl;
+        cout << "A baz on all your houses!" << endl;
+        break;
+    default:
+        cout << "You did not enter 1, 2, or 3." << endl;
+    }
+    return 0;
+}</file>
-===== Nested if/else =====