reverse sentence

Beginner/C++/Reverse sentence

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+//Reverse a sentence using recursion.
+
+
+#include <iostream>
+using namespace std;
+
+// function prototype
+void reverse(const string& a);
+
+int main() {
+  string str;
+
+  cout << " Please enter a string " << endl;
+  getline(cin, str);
+
+  // function call
+  reverse(str);
+
+  return 0;    
+}
+
+// function definition
+void reverse(const string& str) {
+
+  // store the size of the string
+  size_t numOfChars = str.size();
+
+  if(numOfChars == 1) {
+    cout << str << endl;
+  }
+  else {
+    cout << str[numOfChars - 1];
+
+    // function recursion
+    reverse(str.substr(0, numOfChars - 1));
+  }
+}