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  1. //Saliha Babar                CS1A               Chapter 5, Page 294, #1
  2. //
  3. /************************************************************************
  4.  * 
  5.  * CALCULATE SUM OF NUMBERS
  6.  * ______________________________________________________________________
  7.  * This program allows user to enter positive number and calculates the
  8.  * sum of all numbers from 1 to number entered
  9.  * 
  10.  * Calculation is based on the formula
  11.  * sum = 1 + 2 + ... + until the number entered
  12.  *________________________________________________________________________
  13.  * INPUT 
  14.  *    userNumber : user choice of positive number
  15.  *    count      : counter variable for userNumber
  16.  * 
  17.  * OUTPUT
  18.  *    sum        : act as an accumulator
  19.  *                 sum of number 1 up to the number entered
  20.  * *********************************************************************/
  21.  
  22. #include <iostream>
  23. using namespace std;
  24.  
  25. int main() {
  26. 	int userNumber;       // INPUT - user choice of positive number
  27. 	int count;            // Counter variable
  28. 	int sum = 0;          // Accumulator set to 0
  29.  
  30. 	// Get the input from the user
  31. 	cout << "Enter any positive number and I will\n";
  32. 	cout << "calculate the sum of numbers up to number entered.\n";
  33. 	cout << "Enter your number below\n";
  34. 	cin >> userNumber;
  35.  
  36. 	// Validate user input to only accept positive number
  37. 	while (userNumber < 0)
  38. 	{
  39. 		cout << "You entered negative number\n";
  40. 		cout << "Enter a postive number only\n";
  41. 		cin >> userNumber;
  42. 	}
  43.  
  44. 	// Start the loop while accumulating the sum tool
  45. 	for (count = 1 ; count <= userNumber ; count ++)
  46. 	{
  47. 		sum += count; 
  48. 	}
  49.  
  50. 	// Display the output
  51. 	cout << "The sum of number from 1 to " << userNumber << endl;
  52. 	cout << "is " << sum << endl; 
  53.  
  54. 	return 0;
  55. }
Success #stdin #stdout 0.01s 5296KB
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stdin
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9
stdout
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Enter any positive number and I will
calculate the sum of numbers up to number entered.
Enter your number below
The sum of number from 1 to 9
is 45
https://ideone.com/UsR9a4
Chapter 5 Sum of Numbers
language:
C++ (gcc 8.3)
created:
13 hours ago
visibility:
public

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