76 lines
2.3 KiB
C++
76 lines
2.3 KiB
C++
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Champlain College SDEV-340-81
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*
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* C++ Week 5: Assignment (second semester) - Recursion Continued (2020/06/20)
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*
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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*
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* Working with recursion
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* Recursion - Chapter 14 (Page 947)
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* Programming Challenge (4. Recursive Array Sum) Sum numbers recursively
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*
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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*
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* Written by Llewellyn van der Merwe <llewellyn.vandermerw@mymail.champlain.edu>, June 2020
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* Copyright (C) 2020. All Rights Reserved
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* License GNU/GPL Version 2 or later - http://www.gnu.org/licenses/gpl-2.0.html
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*
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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#include <iostream>
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#include <limits>
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using namespace std;
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int sumRecursive(int n, int array[]);
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int main() {
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// set size of input array (large to get all user input)
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int const SIZE = 100;
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// the user input array
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int user_input_array[SIZE];
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// user input length
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int n = 0;
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// now ask for the integers
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cout << "Enter one integer at a time that you would like to sum, and d when done." << endl;
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// get the user input of integers
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for (int & i : user_input_array)
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{
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if (cin >> i){
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n++;
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} else {
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// just reset cin properly
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cin.clear();
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cin.ignore(numeric_limits<streamsize>::max(), '\n');
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break;
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}
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}
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// print out the numbers entered
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for (int i = 0; i < n; i++){
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// print out the value
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cout << user_input_array[i];
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// just add for the first numbers
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if(i + 1 < n) {
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cout << " + ";
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}
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}
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// give back answer
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cout << " = " << sumRecursive(n, user_input_array) << endl;
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return 0;
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}
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// multiply numbers recursively
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int sumRecursive(int n, int array[]) {
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// lower to previous index
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--n;
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// are we at the first element
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if (n == 0) {
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// return first "last" number
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return array[n];
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} else {
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// recursive call
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return array[n] + sumRecursive(n , array);
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}
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}
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