Prompt user to enter number
If entered number is greater than zero store it and repeat step above
If the entered number is less than zero
print the sum of the stored numbers and end.


Ask user for positive integer
when given a number ask for another positive integer.
Repeat until user inputs a negative integer
then add all of the positive integer given and print this integer.


Prompt user for integers ≥0
Once user inputs an integer <0, add up all previous ≥0 inputs
Print the added integers


prompt user for integer
while entered integer is nonnegative
  add it to a running sum
once a negative integer is entered, print the running sum and exit