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  1. //Ryan Shahriyarpour   CS1A    Carl Argila CH5 HW  Q:1
  2. //
  3. /*****************************************************************************
  4.  * 
  5.  * Sum of Numbers
  6.  * 
  7.  *********************
  8.  * 
  9.  * The program asks the user for a positive integer value. The program uses
  10.  * a loop to get the sum of all the integers from 1 up to the number entered.
  11.  * For example, if the user enters 50, the loop will find the sum of 
  12.  * 1, 2, 3, 4, to 50.
  13.  * 
  14.  * INPUT
  15.  *  num : A positive integer entered by the user
  16.  * 
  17.  * OUTPUT    
  18.  *  sum : The sum of all integers from 1 to num
  19.  * 
  20.  ****************************************************************************/
  21.  
  22. #include <iostream>
  23. using namespace std;
  24.  
  25. int main()
  26. {
  27. 	int num;
  28. 	int sum = 0;
  29.  
  30. 	cout << "Enter a positive integer: ";
  31. 	cin >> num;
  32.  
  33. 	// Input validation
  34. 	if (num < 1)
  35. 	{
  36. 		cout << "Error: Please enter a positive integer.\n";
  37. 		return 0;
  38. 	}
  39.  
  40. 	// Calculate the sum
  41. 	for (int i = 1; i <= num; i++)
  42. 	{
  43. 		sum += i;
  44. 	}
  45.  
  46. 	cout << "The sum of 1 through " << num << " is " << sum << endl;
  47.  
  48. 	return 0;
  49. }
Success #stdin #stdout 0s 5308KB
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Standard input is empty
stdout
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Enter a positive integer: The sum of 1 through 21918 is 240210321
https://ideone.com/Jc9lwU
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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