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  1. //Xinnuo Wang                   CS1A                   chapter 5 , P.294, #1
  2. //
  3. /*******************************************************************************
  4. *
  5. * Sum of Numbers
  6. *-------------------------------------------------------------------------------
  7. * This program accepts an intenger nember, sum all the integers from 1 to
  8. * it, and valid the input.
  9. *
  10. * computation is based on the formula:
  11. * sum = numb 1+ numb 2+...+num n
  12. *-------------------------------------------------------------------------------
  13. * INPUT
  14. *    numb n      : the asked and the max number
  15. *  
  16. * OUTPUT
  17. *    total      : the sum of numbers from 1 to n.
  18. *
  19. *******************************************************************************/
  20. #include <iostream>
  21. using namespace std;
  22.  
  23. int main() 
  24. {
  25. 	int numbN;
  26. 	int numb=0;
  27. 	int total=0;
  28. 	cout<< "Enter the max number to sum"<< endl;
  29. 	cin >> numbN;
  30. 	while (numbN<0)
  31. 	{
  32. 		cout<<"Invalid Input"<< endl;
  33. 		return 0;
  34. 	}
  35.  
  36. 	while(numb<=numbN)
  37. 	{
  38. 		total+=numb;
  39. 		numb++;
  40. 	}
  41. 	cout<< "The total is: "<< total<< endl;
  42. 	return 0;
  43. }
Success #stdin #stdout 0s 5312KB
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Enter the max number to sum
The total is: 55
https://ideone.com/smgb61
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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