HI all! With the book of Alex Allain I try to finish this file. I think, being alone, I will never succeed. May someone help me. Here is the code:
Qt Code: 
  1. /*somme.cpp */
  2. #include <iostream>
  3. using namespace std;
  4. //Sum of two numbers 
  5. int failableFunction()
  6. {
  7.         double sum =0;
  8.         double value[40];
  9.         int result=0;
  10.         for (int i = 0; i < 40; ++i )
  11.         {
  12.                 cout << "Enter value:  " << i << ": ";
  13.                 cin >> value[ i ];
  14.                 sum += value[ i ];
  15.         }
  16.         if (result != 0 )//this line here or in the main ?
  17.         {
  18.                 cout << "Function call failed:  "<< result;
  19.  
  20.                 if  (static_cast<int>(value[ i ])== 36 )//36 is ASCII of $//: error: name lookup of ‘i’ changed for ISO ‘for’ scoping [-fpermissive]
  21.  
  22.                 {
  23.                         cout << "Here is the sum :   " <<sum<<endl;
  24.                         double nomb=i;
  25.                         cout << "Here is the average value: " << sum / nomb  << endl;
  26.                         return 0;
  27.                 }
  28.  
  29.         }
  30. }
  31. int main ()
  32. {
  33.         cout << "Here is the addition of many numbers  (even with a .).MAXIMUM OF NUMBERS=39 : \n";
  34.         cout << "Once you have finished your list of numbers, hit $  for indicating the end \n";
  35.         const int result = failableFunction();
  36.         if (result != 0 ) cout << "Function call failed:  " << result ;//this line here or in tha function ?
  37.  
  38. }
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