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--- cplusplus:repetition_examples [2019/02/11 17:49] – [Input validation] mithat
+++ cplusplus:repetition_examples [2019/02/14 21:28] (current) – [Running total] mithat
@@ Line 1: / Line 1: @@
 ====== Control Structures: Repetition examples ======
-===== while =====
+===== The while statement =====
 <file c++ simple_while.cpp>// This program counts to an upper limit
@@ Line 34: / Line 34: @@
     cout << num << endl;
     num++;
-    cout << num << endl;
     return 0;
@@ Line 40: / Line 39: @@
 </file>
-===== Sentinel-controlled repetition =====
+===== Repetition code patterns =====
+==== Counter-controlled repetition ====
+<file c++ counter-controlled-repetition.cpp>// This program counts to an upper limit
+#include <iostream>
+using namespace std;
+int main()
+{
+    const int UPPER_LIMIT = 5;
+    int num = 1;                 // initialize the counter
+    while (num <= UPPER_LIMIT)   // test the count
+    {
+        cout << num << endl;
+        num++;                   // increment the counter
+    }
+    return 0;
+}</file>
+==== Sentinel-controlled repetition ====
 <file c++ simple-sentinel.cpp>    // This program determines whether test scores are passing marks.
@@ Line 76: / Line 97: @@
 </file>
-===== Input validation =====
+==== Input validation ====
-<file c++ simple-input-validation.cpp>    // Simple example of input validation.
+<file c++ simple-input-validation.cpp>// Simple example of input validation.
-    #include <iostream>
+#include <iostream>
-    using namespace std;
+using namespace std;
-    int main()
+int main()
-    {
+{
-        const int LOWER_BOUND = 0;
+    const int LOWER_BOUND = 0;
-        const int UPPER_BOUND = 100;
+    const int UPPER_BOUND = 100;
-        int num;
+    int num;
-        cout << "Enter a number between " << LOWER_BOUND
+    cout << "Enter a number between " << LOWER_BOUND
+         << " and " << UPPER_BOUND << ": ";
+    cin >> num;
+    // Fall through loop only if input is valid.
+    while (num < LOWER_BOUND || num > UPPER_BOUND)
+    {
+        cout << "Enter a number between " << LOWER_BOUND
              << " and " << UPPER_BOUND << ": ";
         cin >> num;
+    }
-        // Fall through loop only if input is valid.
+    cout << "Congratulations, you can follow directions." << endl;
-        while (num < LOWER_BOUND || num > UPPER_BOUND)
-        {
-            cout << "Enter a number between " << LOWER_BOUND
-                 << " and " << UPPER_BOUND << ": ";
-            cin >> num;
-        }
-        cout << "Congratulations, you can follow directions." << endl;
+    return 0;
+}
-        return 0;
+</file>
+==== Running total ====
+<file c++ simple-running-total.cpp>// Simple running total example.
+// Total all the integers between a lower and an upper bound.
+#include <iostream>
+using namespace std;
+int main()
+{
+    const int LOWER_BOUND = 0;
+    const int UPPER_BOUND = 10;
+    int num = LOWER_BOUND;  // counter
+    int sum = 0;            // accumulator
+    while (num <= UPPER_BOUND)
+    {
+        sum += num;         // add the new value to the accumulator
+        num++;
     }
+    cout << "The sum of integers from " << LOWER_BOUND
+         << " to " << UPPER_BOUND
+         << " is " << sum << endl;
+    return 0;
+}
 </file>
-===== for =====
+===== The for statement =====
 <file c++ simple-for.cpp>// This program counts to an upper limit using a for structure.
 #include <iostream>