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  1. //Dione Torrevillas                 CS1A                 Chapter 5, P. 294, #1
  2. //
  3. /**********************************************************************
  4.  *
  5.  * SUM OF NUMBERS
  6.  *
  7.  * This program asks the user to enter a positive integer.
  8.  * It then uses a loop to add all integers from 1 up to the
  9.  * number entered by the user.
  10.  *
  11.  * Computation is based on repeatedly adding each number:
  12.  * sum = sum + count
  13.  *
  14.  * INPUT
  15.  *   number       : Positive integer entered by the user
  16.  *
  17.  * OUTPUT
  18.  *   sum          : Sum of all integers from 1 through number
  19.  *
  20.  **********************************************************************/
  21.  
  22. #include <iostream>
  23. using namespace std;
  24.  
  25. int main()
  26. {
  27.     int number;     //INPUT  - Positive integer entered by user
  28.     int count;      //CALC   - Loop counter
  29.     int sum = 0;    //OUTPUT - Sum of the integers
  30.  
  31.     //
  32.     // Get User Input
  33.     //
  34.     cout << "Enter a positive integer: ";
  35.     cin >> number;
  36.  
  37.     //
  38.     // Validate Input
  39.     //
  40.     while (number < 1)
  41.     {
  42.         cout << "Please enter a positive integer: ";
  43.         cin >> number;
  44.     }
  45.  
  46.     //
  47.     // Compute Sum
  48.     //
  49.     for (count = 1; count <= number; count++)
  50.     {
  51.         sum += count;
  52.     }
  53.  
  54.     //
  55.     // Output Result
  56.     //
  57.     cout << "The sum of the integers from 1 to "
  58.          << number << " is " << sum << "." << endl;
  59.  
  60.     return 0;
  61. }
Success #stdin #stdout 0.01s 5300KB
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Standard input is empty
stdout
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Enter a positive integer: The sum of the integers from 1 to 21949 is 240890275.
https://ideone.com/kWURtM
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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