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  1. //Amari Mosley 			CSC5 			Chapter 5, P. 294, #1
  2. //
  3. /**************************************************************
  4. *
  5. * COMPUTE SUM OF NUMBERS
  6. *____________________________________________
  7. * This program asks the user for a positive integer value 
  8. * and uses a loop to find the sum of all integers from 1 up 
  9. * to the number entered, with input validation to reject 
  10. * negative starting numbers.
  11. *
  12. * INPUT
  13. *   number        : Positive integer entered by the user
  14. *
  15. * OUTPUT
  16. *   sum           : Sum of all integers from 1 up to the entered 
  17. *                   number
  18. *
  19. **************************************************************/
  20.  
  21. #include <iostream>
  22.  
  23. using namespace std;
  24.  
  25. int main() {
  26.     // INPUT
  27.     int number;
  28.  
  29.     // OUTPUT
  30.     int sum = 0;
  31.  
  32.     // Initialize Program variables / Input Validation Loop
  33.     cout << "Enter a positive integer value: ";
  34.     cin >> number;
  35.  
  36.     while (number < 0) {
  37.         cout << "Error: Do not accept a negative starting number.\n";
  38.         cout << "Enter a positive integer value: ";
  39.         cin >> number;
  40.     }
  41.  
  42.     // Compute Sum of Numbers using a loop
  43.     for (int i = 1; i <= number; i++) {
  44.         sum += i;
  45.     }
  46.  
  47.     // Output Result
  48.     cout << "The sum of all integers from 1 up to " << number << " is " << sum << "." << endl;
  49.  
  50.     return 0;
  51. }
Success #stdin #stdout 0s 5316KB
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Enter a positive integer value: The sum of all integers from 1 up to 11 is 66.
https://ideone.com/h5cjlY
Ch5, #1
language:
C++ (gcc 8.3)
created:
20 hours ago
visibility:
public

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