# Nested if-else constructs in JavaScript

The `if-else` constructs can be nested arbitrarily. See an example:

`let num = 3; if (num >= 0) { if (num <= 5) { console.log('less than or equal to 5'); } else { console.log('greater than 5'); } } else { console.log('less than zero'); }`

Let the variable `num` store a number. If this number falls within the range from `10` to `99`, then find the sum of the digits of this number. If the resulting sum is less than or equal to `9`, then print a message that the sum of the digits is single-digit, otherwise, print a message that the sum of the digits is two-digit.

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