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Exercise 2

Using arithmetic operators, get the individual digits of a 4-digit number like 4936:

thousands place is 4
hundreds place is 9
tens place is 3
ones place is 6

Use number % 10 to determine the rightmost digit. Then use that value and % again to get the tens digit. Repeat until you have all 4 digits.

Once you have the ones digit from the previous hint, subtract it from the current number, then divide the result by 10. Repeat hint 1 to get the next digit.

Solution

> let number = 4936
> let ones = number % 10
> ones
= 6

> number = (number - ones) / 10
= 493

> let tens = number % 10
> tens
= 3

> number = (number - tens) / 10
= 49

> let hundreds = number % 10
> hundreds
= 9

> let thousands = (number - hundreds) / 10
> thousands
= 4

Note that for the thousands digit, you don't need to use %.

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