The expansion of classroom practice 30 arithmetic questions----ideas

Add:
1. Avoid duplication of topics;
2, can be customized (quantity/printing method):
3, can control the following parameters (whether there is a multiplication method, whether there are parentheses, the range of values, plus or minus a negative number, division has zero, whether the support score (true score, false score)):
Design ideas:
(whether there is a multiplication method) can be printed on the number of topics entered in the way input, defined as the number of cycles.
When choosing, 0, 1 is addition, 2, 3 is subtraction, 4, 5 is multiplication, 6, 7 is division,
When customizing the selection of which operation symbol to output, the number is selected to that range.
(whether there are parentheses)
(The range of values) can modify the range of a numeric value directly by modifying the multiple of the random number to be generated.
(plus or minus) if you need a negative number, define a method to subtract the two digits by 100.

The expansion of classroom practice 30 arithmetic questions----ideas