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--- cplusplus:repetition_examples [2019/02/11 17:31] – [Sentinel-controlled repetition] mithat
+++ cplusplus:repetition_examples [2019/02/11 18:01] – [Input validation] mithat
@@ Line 76: / Line 76: @@
 </file>
+===== Input validation =====
+<file c++ simple-input-validation.cpp>// Simple example of input validation.
+#include <iostream>
+using namespace std;
+int main()
+{
+    const int LOWER_BOUND = 0;
+    const int UPPER_BOUND = 100;
+    int num;
+    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;
+    }
+    cout << "Congratulations, you can follow directions." << endl;
+    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 sum
+        num++;
+    }
+    cout << "The sum of integers from " << LOWER_BOUND
+         << " to " << UPPER_BOUND
+         << " is " << sum << endl;
+    return 0;
+}
+</file>
 ===== for =====
-<file c++ simple-for.cpp>// This program counts to an upper limit
+<file c++ simple-for.cpp>// This program counts to an upper limit using a for structure.
-// using a for structure.
 #include <iostream>
 using namespace std;