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  1. // Cenyao Huang                             CS1A                         Homework 5, p. 294, #1
  2.  
  3. /******************************************************************************************************
  4. * CALCULATE THE SUM OF INTEGERS
  5. *
  6. * This program calculates the sum of the integers from 1 up to the number that was input.
  7. *
  8. * Input
  9. * num : the value of the number that was input
  10. * start_num : the value of the 
  11. * Output
  12. * the sum of the integers from 1 up to the number that was input
  13. *
  14. ***************************************************************************************************/
  15. #include <iostream>
  16. using namespace std;
  17.  
  18. int main() {
  19. 	// Data dictionary
  20.     int num, start_num, sum;
  21.  
  22.     // Request a number
  23.     cout << "Enter a positive integer value: ";
  24.     cin >> num;
  25.     cout << num <<"";
  26.  
  27.     // Input validation
  28.    if (num < 0)
  29.    cout << endl << "Do not enter a negative number. Please try again.";
  30.  
  31.     // Calculate sum
  32.     sum = 0;
  33. 	for (start_num = 1; start_num <= num; start_num++) 
  34.    {
  35.         cout << endl << start_num;
  36.         sum += start_num;
  37.    }
  38.  
  39.         if (num >= 0)
  40.         cout << endl << "sum = " << sum;
  41.  
  42. 	return 0;
  43. }
Success #stdin #stdout 0s 5316KB
comments (?)
stdin 
Standard input is empty
stdout 
Enter a positive integer value: 0
sum = 0
https://ideone.com/bE8Xb6
sum of numbers- ch5
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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