Variable declaration reset: Difference between revisions

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@@ Line 97: / Line 97: @@
   constexpr std::array s {1,2,2,3,4,4,5};
+  if(!s.empty())
-  // declare a variable outside of the loop to hold the previous value. At
-  // this point it is undefined which is OK as long as it is set before
-  // it is used.
-  int previousValue;
-  for(size_t i = 0; i < s.size(); ++i)
   {
+    int previousValue = s[0];
-    // in C++, variables in block scope are reset at each iteration
-    const int currentValue = s[i];
-    if(i > 0 && previousValue == currentValue)
+    for(size_t i = 1; i < s.size(); ++i)
     {
+      // in C++, variables in block scope are reset at each iteration
-      std::cout << i << "\n";
+      const int currentValue = s[i];
+      if(i > 0 && previousValue == currentValue)
+      {
+        std::cout << i << "\n";
+      }
+      previousValue = currentValue;
     }
-    previousValue = currentValue;
   }
 }
 </lang>
 {{out}}