Answer:
(not quite sure what the question is asking seems you need, but bare minimum is)
an initial value and an increment or decrement
a condition where the loop stops
Step-by-step explanation:
assuming you have the structure for the loop, depending on the language it could be a for, while or until command. You will always need the initial value for the variable your looping on, how it changes (increment or decrement) and then a condition when the looping in to stop.
e.g. say you want to add up the numbers from 1 to 10, inclusive
sum = 0
for I is 1 to 10 incremented by 1
sum=sum+I
end of loop