# How to Generate Random Numbers and range of numbers in Dart or Flutter Programming with example

This tutorial shows multiple methods for generating random numbers in the Dart programming language.

A random number is a unique value generated within a specified range, ensuring unpredictability for various requests. The generated number always falls within the provided range of values.

## #Dart Random Number Generator Example

Dart’s `dart:math` library includes a Random class for random number generation. It offers the `nextInt` method, which accepts a maximum value and returns a random number.

``````int nextInt(int max)
``````

The minimum number is implicitly taken as zero, while the maximum number is the given max value.

Here’s a simple example of generating random numbers:

``````import 'dart: math';

main() {
var random = Random();
print(random.nextInt(10)); //Random number between 0 to 10
print(random.nextInt(100)); //Random number between 0 to 100
print(random.nextInt(200)); //Random number between 0 to 100
print(random.nextInt(1000)); //Random number between 0 to 1000
}
``````
• Import the `dart:math` package using the import keyword.
• Create a Random variable using the `var` keyword.
• Call `nextInt()` with the maximum range.
• Random numbers are always generated between 0 and the provided maximum value.

Output:

``````4
70
47
294
``````

## #Dart Random Number Generator within a Range Example

This example generates random numbers within a specified range between the minimum and maximum values.

``````import 'dart:math';

main() {
var random = Random();
int min = 10;
int max = 20;
var randomNumber = min + random.nextInt(max - min);
print("\$randomNumber is random number between \$min and \$max");
print(randomNumber);
}
``````

Output:

``````19 is a random number between 10 and 20
19
``````

## #How to Generate a Random Number in Dart Excluding a Particular Number?

For instance, if you wish to generate a random number between 0 and 10, excluding the number 5, you can follow this example.

``````import 'dart:math';

main() {
var random = Random();
var excludeNumber = 5;
var randomNumber;
do {
randomNumber = random.nextInt(10);
} while (randomNumber == excludeNumber);
print(randomNumber);
}
``````