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  1. //Timothy Price			CS1A			CH5 Challenge 1
  2. /*******************************************************************************
  3.  * Calculate total
  4.  * 
  5.  * This program receives a number and calculates the total of all previous
  6.  * numbers up to the selected number.
  7.  * 
  8.  * Inputs:
  9.  * Positive number
  10.  * 
  11.  * Output:
  12.  * Sum of numbers
  13.  ******************************************************************************/
  14.  
  15. #include <iostream>
  16.  
  17. using namespace std;
  18.  
  19. int main() {
  20.  
  21. 	// Data dictionary:
  22.     int number;		// The number must be positive
  23.     int sum = 0;
  24.  
  25. 	// Program asks for a positive value, and gives choice feedback:
  26.     cout << "Enter a positive integer value: " << endl;;
  27.     cin >> number;
  28.     cout << "You have entered the number " << number << "." << endl;
  29.  
  30. 	// Rejection for invalid input:
  31.     if (number <= 0) {
  32.         cout << "Invalid input. Please enter a positive integer: " << endl;
  33.     }
  34.     // For valid input:
  35.     if (number > 0) {		// Loop crated to calculate sum of all numbers:
  36. 		for (int base = 1; base <= number; ++base) {
  37. 			sum += base;
  38. 		}
  39. 		// Display sum:
  40. 		cout << "The sum of all numbers between 1 and " << number << " is ";
  41. 		cout << sum << "." << endl;
  42.     }
  43.     return 0;
  44. }
Success #stdin #stdout 0.01s 5328KB
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stdin
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15
stdout
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Enter a positive integer value: 
You have entered the number 15.
The sum of all numbers between 1 and 15 is 120.
https://ideone.com/k10L57
ch5 - sum of all numbers
language:
C++ (gcc 8.3)
created:
19 hours ago
visibility:
public

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