Adding a sequence of n numbers
x[0], x[1], ..., x[n-1] sequence of n numbers.(n=100, say).
Consider (abstract representation)
sum = 0 # initialise memory location
n = 100 # initialise boundary condition
i = 0 # initialise counter
LOOP: # label
sum = sum + x[i] #overwrite sum
i = i+1 #increment counter
if (i != n) then go to LOOP