How to use an accumulating variable
From Progzoo
When using an accumulating variable there are three stages:
- Initialise
We declare our accumulator and set it to an initial values.
- Update
Inside the loop we update the accumulator - we take into account the current data item.
- Output/use
After the loop our accumulator contains the required value. We use it or output it.
Contents |
Using an accumulator to add.
- We initialise to 0.
- We add to the accumulator.
- The value printed is the sum 0+2+7+1+1.
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Using an accumulator to count.
- We initialise to 0.
- We increment the accumulator.
- The value printed is the count: 0+1+1+1+1.
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Using an accumulator to multiply.
- We initialise to 1.
- We multiply the accumulator.
- The value printed is the product: 1*2*7*1*1
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Using an accumulator to find the maximum.
- We initialise to 0.
- We take the max.
- The value printed is the largest:
max(max(max(max(0,2),7),1),1)
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Using an accumulator to concatenate.
- We initialise to "".
- We concatenate the next value.
- Each time i gets converted to a string and is put at the end.
- The answer is ""+2+7+1+1
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Using two accumulators to find the mean.
- We initialise both to 0.
- We add to the sum and increment the count.
- We divide the sum by the count to get the average.
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Using an accumulator to calculate.
- We initialise to 0.
- We multiply by the radix and add the next digit.
- By the end the number 2 has been multiplied by 10 three times,
the number has been multiplied by 10 twice...
- 10*(10*(10*2+7)+1)+1
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