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POC++ Array copying/shift
 

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    <p>We had a project that asked us to Write a program that allows a user to enter a series of numbers "read numbers into an array for further processing, user signals that they are finished by entering a negative number (negative not used in calculations), after all numbers have been read in do the following, sum up the #'s entered, count the #'s entered, find min/max # entered, compute average, then output them on the screen. So the working version of this that I made looks like so</p> <pre><code>/* Reads data into array. paramater a = the array to fill paramater a_capacity = maximum size paramater a_size = filled with size of a after reading input. */ void read_data(double a[], int a_capacity, int&amp; a_size) { a_size = 0; bool computation = true; while (computation) { double x; cin &gt;&gt; x; if (x &lt; 0) computation = false; else if (a_size == a_capacity) { cout &lt;&lt; "Extra data ignored\n"; computation = false; } else { a[a_size] = x; a_size++; } } } /* computes the maximum value in array paramater a = the array Paramater a_size = the number of values in a */ double largest_value(const double a[], int a_size) { if(a_size &lt; 0) return 0; double maximum = a[0]; for(int i = 1; i &lt; a_size; i++) if (a[i] &gt; maximum) maximum = a[i]; return maximum; } /* computes the minimum value in array */ double smallest_value(const double a[], int a_size) { if(a_size &lt; 0) return 0; double minimum = a[0]; for(int i = 1; i &lt; a_size; i++) if (a[i] &lt; minimum) minimum = a[i]; return minimum; } //computes the sum of the numbers entered double sum_value(const double a [], int a_size) { if (a_size &lt; 0) return 0; double sum = 0; for(int i = 0; i &lt; a_size; i++) sum = sum + a[i]; return sum; } //keeps running count of numbers entered double count_value(const double a[], int a_size) { if (a_size &lt; 0) return 0; int count = 0; for(int i = 1; i &lt;= a_size; i++) count = i; return count; } int _tmain(int argc, _TCHAR* argv[]) { const int INPUT_CAPACITY = 100; double user_input[INPUT_CAPACITY]; int input_size = 0; double average = 0; cout &lt;&lt; "Enter numbers. Input negative to quit.:\n"; read_data(user_input, INPUT_CAPACITY, input_size); double max_output = largest_value(user_input, input_size); cout &lt;&lt; "The maximum value entered was " &lt;&lt; max_output &lt;&lt; "\n"; double min_output = smallest_value(user_input, input_size); cout &lt;&lt; "The lowest value entered was " &lt;&lt; min_output &lt;&lt; "\n"; double sum_output = sum_value(user_input, input_size); cout &lt;&lt; "The sum of the value's entered is " &lt;&lt; sum_output &lt;&lt; "\n"; double count_output = count_value(user_input, input_size); cout &lt;&lt; "You entered " &lt;&lt; count_output &lt;&lt; " numbers." &lt;&lt; "\n"; cout &lt;&lt; "The average of your numbers is " &lt;&lt; sum_output / count_output &lt;&lt; "\n"; string str; getline(cin,str); getline(cin,str); return 0; } </code></pre> <p>That went fine, the problem I am having now is part 2. Where we are to "copy the array to another and shift an array by N elements". I'm not sure where to begin on either of these. I've looked up a few resources on copying array's but I was not sure how to implement them in the current code I have finished, especially when it comes to shifting. If anyone has any thoughts, ideas, or resources that can help me on the right path it would be greatly appreciated. I should point out as well, that I am a beginner (and this is a beginners class) so this assignment might not be the 'optimal' way things could be done, but instead incorporates what we have learned if that makes sense. </p>
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    1. COC++ has a [nice set of algorightms](http://en.cppreference.com/w/cpp/algorithm/rotate_copy) that you can use, for example [`std::rotate_copy`](http://en.cppreference.com/w/cpp/algorithm/rotate_copy) which seems to do what you want.
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