Acum : Defining Accumulation Procedures

Contrary to the other accumulators, accum has three default inputs and one optional input :

• "acum" : collects the successive elements of a list returned by an iterator
• "init" : initial value of the accumulator
• "fun" : an accumulation function to apply to each collected element.
• first output :

1. collects the input value and applies the accumulation function

2. returns the current state of the accumulator.

• second output : returns the finale value of acum.
• third output : resets the accumulator to the value specified by "init".

The initial value of acum is 100. Om- is set on "lambda" mode it is connected to the third output of acum. It is applied recursively to the elements of the list and to the initial value. We get (100 - a - b - c - d).

1. Listloop returns the successive elements of the list to acum.

2. At each step of the iteration, the first print box prints the successive current values of acum : 100 ; 100-8 = 92 ; 92-2 = 90 ; ...

3. At each step of the iteration, the second print box prints the result of the subtraction, which is then stored as the new current value of accum.

4. When the iteration is over, Finally returns the final state of acum.