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  1. //Matthew Santos     CS1A     Ch. 5, Pg. 294, #1
  2. /***********************************************
  3.  * 
  4.  * SUM OF NUMBERS
  5.  * _____________________________________________
  6.  * For a positive integer, adds the sum of all
  7.  * the numbers from 1 to the number entered.
  8.  * _____________________________________________
  9.  * INPUT
  10.  *      num: number entered
  11.  * 
  12.  * OUTPUT
  13.  *      sum: sum of all the numbers 1-num
  14.  ***********************************************/
  15. #include <iostream>
  16. using namespace std;
  17.  
  18. int main() {
  19.  
  20. 	int num;       //User inputted number
  21. 	int sum;       //Sum of numbers
  22.  
  23. 	//Get number
  24. 	cin >> num;
  25.  
  26. 	//Determine if positive then calculate
  27. 	if (num >= 0)
  28. 	{
  29. 		for (int i = 0; i <= num; i++)
  30. 		{
  31. 			sum += i;
  32. 		}
  33. 		//Outputs sum
  34. 		cout << sum << endl;
  35. 	}
  36. 	else
  37. 	{
  38. 		cout << "Enter a positive number" << endl;
  39. 	}
  40. 	return 0;
  41. }
Success #stdin #stdout 0.01s 5308KB
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https://ideone.com/Iqtpyp
language:
C++ (gcc 8.3)
created:
21 hours ago
visibility:
public

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