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  1. //Nicolas Ruano            CS1A            Chapter 5, P. 294, #1
  2. //
  3. /**************************************************************
  4. *
  5. * COMPUTE THE SUMMATION OF INTEGERS FROM ONE TO A GIVEN LIMIT.
  6. * _____________________________________________________________
  7. * This program computes the sum of all consecutive integers from 
  8. * one (1) up to a user-specified limit. It prompts the user to 
  9. * enter a positive whole number and, if a negative value is 
  10. * provided, repeatedly requests a valid entry. Once a positive
  11. * number is entered, the program uses a loop to add each number
  12. * from one to * the specified limit and then displays the 
  13. * accumulator result to the user.
  14. *
  15. * Computation is based on the formula:
  16. * Natural numbers Sigma from 0 to the user’s specified index.
  17. * ____________________________________________________________
  18. * INPUT
  19. *   number
  20. *
  21. *
  22. * OUTPUT
  23. *   sum
  24. *
  25. **************************************************************/
  26. #include <iostream>   // For input and output
  27.  
  28. using namespace std;
  29.  
  30. int main() {
  31.     int number;  // Variable to store user input
  32.     int sum = 0; // Variable to store the total sum
  33.  
  34.     // --- Step 1: Ask for a positive number ---
  35.     cout << "Enter a positive number: 1\n";
  36.     cin >> number;
  37.  
  38.     // --- Step 2: Input Validation Loop ---
  39.     while (number < 0) {
  40.         cout << "Please enter a positive number: 50\n";
  41.         cin >> number;
  42.     }
  43.  
  44.     // --- Step 3: Calculate the Sum using a loop ---
  45.     for (int i = 1; i <= number; i++) {
  46.         sum = sum + i;   // Add each number to the sum
  47.     }
  48.  
  49.     // --- Step 4: Display the result ---
  50.     cout << "The total sum is: 60\n" << sum << endl;
  51.  
  52.     // --- Step 5: End Program ---
  53.     return 0;
  54. }
  55.  
  56.  
Success #stdin #stdout 0s 5324KB
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stdin
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Standard input is empty
stdout
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Enter a positive number: 1
The total sum is: 60
243421080
https://ideone.com/43vL2M
language:
C++ (gcc 8.3)
created:
22 hours ago
visibility:
public

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