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  1. //Jeremy Huang CS1A Chapter 5, P. 294, #1
  2. //
  3. /**************************************************************
  4.  *
  5.  * COMPUTE SUM OF NUMBERS
  6.  * ____________________________________________________________
  7.  * This program takes user input of a positive integer and sums
  8.  * from 1 to what ever number is inputted and outputs that 
  9.  * number.
  10.  * ____________________________________________________________
  11.  * INPUT
  12.  * number        : number which user inputs
  13.  *
  14.  * OUTPUT
  15.  * sum           : sum of numbers 1 to number
  16.  *
  17.  **************************************************************/
  18.  
  19. #include <iostream>
  20. using namespace std;
  21.  
  22. int main() {
  23. 	int number;     //INPUT - number which user inputs
  24. 	int sum=0;      //OUTPUT - sum of numbers 1 to number
  25.  
  26. 	//User Input
  27. 	cout<<"Please enter a positive integer: "<<endl;
  28. 	cin>>number;
  29.  
  30. 	while(number<1)
  31. 	{
  32. 	    cout<<"Invalid input, must be a positive integer."<<endl;
  33. 	    cout<<"Please enter a new number: "<<endl;
  34. 	    cin>>number;
  35. 	}
  36.  
  37. 	//Output Result
  38. 	for (int i = 1; i<=number; i++)
  39. 	   sum +=i;
  40.  
  41. 	cout<<"The sum of the integers from 1 to "<<number<<" is: "<<sum<<endl;
  42. 	return 0;
  43. }
Success #stdin #stdout 0.01s 5308KB
comments (?)
stdin 
-1
50
stdout 
Please enter a positive integer: 
Invalid input, must be a positive integer.
Please enter a new number: 
The sum of the integers from 1 to 50 is: 1275
https://ideone.com/znrahk
language:
C++ (gcc 8.3)
created:
8 days ago
visibility:
public

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