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  1. //Eun Hyeung Lucia Lee         CSC5       Chapter 5, P. 295, #1
  2. //
  3. /**************************************************************
  4.  * CALCULATE SUM
  5.  * ____________________________________________________________
  6.  * This program prompts the user for a positive integer value. 
  7.  * The program then computes the sum of all the integers from
  8.  * 1 to the input integer.
  9.  * 
  10.  * No negative starting numbers are accepted.
  11.  * ____________________________________________________________
  12.  * INPUT
  13.  *	 max_num				: Positive integer that will be 
  14.  *							  used as max for sum
  15.  * 
  16.  * OUTPUT
  17.  *	 sum					: Sum of all integers added to the
  18.  *							  max_num
  19.  * PROCESSING	
  20.  *	count					: Counter integer set to 1 that 
  21.  *							  controls the loop by comparison
  22.  *							  to the max_num
  23.  **************************************************************/
  24.  #include <iostream>
  25. using namespace std;
  26.  
  27. int main() 
  28. {
  29. 	// Define variables
  30. 	int count;			// PROCESSING - Counter for loop
  31. 	int max_num;		// INPUT - Positive integer used as max
  32. 	int sum = 0;		// OUTPUT - Total sum of all integers based on max
  33.  
  34. 	// Ask for user input
  35. 	cout << "Please enter a positive integer: " << endl;
  36. 	cin >> max_num;
  37.  
  38. 	// For invalid inputs (negative)
  39. 	while (max_num <=0)
  40. 	{
  41. 		cout << "<Error: Please input a POSITIVE integer>" << endl;
  42. 		cin >> max_num;
  43. 	}
  44.  
  45. 	// For valid inputs
  46. 	for (count = 1; count <= max_num && max_num >= 1; count++)
  47. 	{
  48. 		// Display sums
  49. 		cout << count << " + " << sum << " = "; 
  50. 		sum += count;
  51. 		cout << sum << endl;	// Updated sum
  52. 	}
  53.  
  54. 	return 0;
  55. }
Success #stdin #stdout 0s 4460KB
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stdin
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-5
5
stdout
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Please enter a positive integer: 
<Error: Please input a POSITIVE integer>
1 + 0 = 1
2 + 1 = 3
3 + 3 = 6
4 + 6 = 10
5 + 10 = 15
https://ideone.com/1skKII
Homework Ch 5, P. 294, #1
language:
C++ (gcc 8.3)
created:
6 years ago
visibility:
public

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