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  1. //Charlotte Davies-Kiernan             CS1A                 Chapter 5 P.294 #1 
  2. //
  3. /******************************************************************************
  4.  * 
  5.  * Compute Sum of Numbers
  6.  * ____________________________________________________________________________
  7.  * This program will get the sum of all integers from 1 up to the number the 
  8.  * user has entered. Positive integers are only allowed!
  9.  * ___________________________________________________________________________
  10.  * Input
  11.  *   number           //the number the user has decided to enter
  12.  * Output
  13.  *  sum               //sum of all integers from 1 up to the number entered 
  14.  *****************************************************************************/
  15. #include <iostream>
  16. #include <iomanip>
  17. using namespace std;
  18. int main() 
  19. {
  20. 	int number;         //INPUT - number the user has entered 
  21. 	int sum=0;           //OUTPUT - sum of all integers from 1 to the number entered
  22. //
  23. //Prompt User
  24. do {
  25. 	cout << "Enter a positive integer: " << endl;
  26. 	cin >> number;
  27. 	if (number < 0) 
  28. 		cout << "Invalid input. Please enter a positive integer." << endl;
  29. } while (number < 0);
  30. //
  31. //Calculate Sum
  32. for (int i = 1; i <= number; i++){
  33.      sum += i;
  34. }
  35. //
  36. //Output!
  37. cout << "The sum of numbers from 1 to " << number << " is " << sum << "." << endl;
  38. 	return 0;
  39. }
Success #stdin #stdout 0.01s 5288KB
comments (?)
stdin
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50
stdout
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Enter a positive integer: 
The sum of numbers from 1 to 50 is 1275.
https://ideone.com/eJ7Oc3
language:
C++ (gcc 8.3)
created:
9 days ago
visibility:
public

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