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To round a number in Dart, you can use the round() method. Here's an example:
double number = 3.14159;
int roundedNumber = number.round();
print(roundedNumber); // Output: 3
In this example, we create a double variable called number and assign it the value of 3.14159. We then use the round() method to round the number to the nearest integer, which results in 3. Finally, we print the rounded number to the console.