This program will calculate the sum of integer values. Write a program that asks

Question

This program will calculate the sum of integer values.

   Write a program that asks the user for a positive integer value (between 1 and 1000)
   and that uses a loop to validate the input. The program should then use a second
   loop to compute the sum of all the integers from 1 to the number entered.
   For example, if the user enters 50, the loop will find the sum of 1, 2, 3, 4, ...,50.
*/

#include <iostream>
using namespace std;

int main()
{
   // TODO STEP 1: Declare 3 integer type variables:
   //   - type int, named sumTo, to hold the user's entry of what to sum up to
   //   - type int, named count, to serve as the loop control variable when summing
   //   - type int, named total, to accumulate the sum
   //
   // Initialize the total accumulator to 0.

   // TODO STEP 2: Prompt the user and get the number to sum up to (the sumTo)
   // (in the fashion demonstrated in the SAMPLE OUTPUT below).
  

   // TODO STEP 3: Write a loop to validate that the user entered a number between 1 to 1000
   // Display an error message if the user made an incorrect entry and prompt them to make
   // a new entry. Be sure to use the type of loop BEST suited for this circumstance, where
   // the user may make zero or more mistakes (though the exact number is not known) before
   // finally entering a value that falls in the correct range. Once again, refer to the
   // SAMPLE OUTPUT below to determine the correct formatting of the error message.

   // TODO STEP 4: Write a loop to sum from 1 to the number the user entered (sumTo).
   // You will need to use the variable named 'total' to accumulate the sum and the variable
   // named 'count' will be used as the loop control variable. Be sure to use the type of
   // loop BEST suited for this circumstance, where the number of times the loop needs to
   // execute IS known before the loop starts. The number of times the loop iterates may
   // not be known before the program is run, but it IS known before the loop executes (and
   // the value should be stored in a variable if you did the steps above correctly).

   // TODO STEP 5: Display the results to the user (in the fashion demonstrated in the
   // SAMPLE OUTPUT below).

   return 0;                      
}

/*
************************* SAMPLE OUTPUT #1 *******************************
Enter a positive whole number (no larger than 1000): -7
ERROR: Enter a positive integer value (no larger than 1000): 0
ERROR: Enter a positive integer value (no larger than 1000): 1001
ERROR: Enter a positive integer value (no larger than 1000): 100

The sum of numbers up to 100 is 5050.
Press any key to continue . . .

************************* SAMPLE OUTPUT #2 *******************************
Enter a positive whole number (no larger than 1000): 50

The sum of numbers up to 50 is 1275.
Press any key to continue . . .
*/

Explanation / Answer

#include <iostream>
using namespace std;
int main ()
{
int sum = 0;
int num;
cout << "Enter a positive whole number (no larger than 1000):. ";
cin >> num;
if (num >= 1 && num<1000){   
for (int counter = 0; counter <= num; counter++)
  
{
sum = sum + num;
  
counter++;
}
  
cout << "The sum of numbers upto " << num << " " << "is " << sum << endl;
} else if(num>1000) {
cout << " ERROR: Enter a positive integer value (no larger than 1000). ";
  
} else {
cout << " " << num << " is an invalid input.";
cout << " ERROR:Enter a positive whole number greater than 0. ";
  
}
  
return 0;
}

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