Суммы и произведения
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## Суммы и произведения

Syntax:

    sum <identifier> = <from> to <to> do <body>
    sum <identifier> = <from> to <to> by <increment> do <body>
    sum <identifier> in <matrix> do <body>
    prod <identifier> = <from> to <to> do <body>
    prod <identifier> = <from> to <to> by <increment> do <body>
    prod <identifier> in <matrix> do <body>

If you substitute `for` with `sum` or `prod`, then you will get a sum or a product instead of a `for` loop. Instead of returning the last value, these will return the sum or the product of the values respectively.

Если тело цикла не вычислялось (например, `sum i=1 to 0 do ...`), то `sum` возвращает 0, а `prod` возвращает 1.

For floating point numbers the same roundoff error protection is done as in the for loop. See the section called “Циклы For”.

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