# Generating a Random Number

# Overview

random

**Return**: Returns a random number between 0.0 (inclusive) and 1.0 (exclusive) (ex. 0.738).**Arguments:**None**Usage**: random()**Example Usage:**When you need to generate a random number.For example, to generate a number between 5 (inclusive) and 23 (exclusive), you can use (random()*(23 - 5)) + 5. This will be something like 12.43334.

You can convert that to a whole number by using int((random()*(23 - 5)) + 5). You can also reference questions instead of directly typing numbers.

Ex. int(random()*(#form/high_num - #form/low_num) + #form/low_num).

The output varies between low_num (inclusive) and high_num (exclusive)

You can generate either a random decimal number (ex. 8.9) or a random integer (ex. 22) using the random() function. Set the calculate expression of your question to the following:

For a random decimal: start_num + (random() * (end_num - start_num)) For example, to generate random number between 10.3 and 30.9, you can use 10.3 + (random() * (30.9 - 10.3))

For a random integer: start_num + int(random() * (end_num - start_num)) For example, to generate random number between 9 and 22, you can use 9 + int(random() * (22 - 9))

You can also replace start_num and end_num with references to other questions in your form (ex. #form/my_start_range_question). Please make sure that they are required or have value so that the calculate expression works.

**Notes on the random() Function:**

If random() is used within a calculate or display condition, the value will change and be recalculated many time as the form is filled out

To generate a random number once when the form is opened, add a hidden value and then put the random() logic inside the Default Value logic of the hidden value (its in Advanced Section).

If you're using random() to generate or calculate number that is shown to the user, then its best practice to put random() inside of the default value section as described above.