{

# How to convert Double to Integer or Integer to double in Dart| Flutter By Example

This tutorial shows multiple ways to Convert Double to Int and Int to double in Dart and Flutter programming. `Int` is a primitive type that stores numeric numbers arbitrary-precision signed integer without decimals, Examples Int types values are 1,5.

`Double` is a primitive type that stores IEEE-754 double-precision floating numbers. Example double type values are 1.34,1.0.

`Int` and `Double` are different types and hold different values. Automatic conversion does not happen in the Dart compiler.

We have manually converted from one type to another type.

## How to convert Double to Int type in Dart programming?

There are multiple ways we can parse double to int in dart programming.

• use Double toInt() method double.toInt() method removes the decimals from a given double number and returns int.

Syntax.

``````Int toInt()
``````

Here is an `Double toInt() Example`

``````main() {
double double1 = 3.4;
print(double1.runtimeType); // double
int i1 = double1.toInt();
print(i1); // 3
print(i1.runtimeType); // int
}
``````
• Double truncate() method

double. truncate() method also ignores the decimal value and returns the int value.

Syntax:

``````int truncate()
``````

Here is a `double truncate() example program`

``````main() {
double double1 = 12.9;
print(double1.runtimeType); // Double
int i1 = double1.truncate();
print(i1); // 12
print(i1.runtimeType); // int
}
``````

Another way, There are methods - round(), ceil(), floor() which will give rounded of a given double number in dart and flutter

• rounded a numbers using round(),ceil(), floor()

• `round() method`: returns the closest int number. For example 6.5.round() returns 7.

Here is a `round() method example program`

``````    main() {
double double1 = 12.9;
double double2 = 3.4;

print(double1.runtimeType); // double
print(double2.runtimeType); // double

int i1 = double1.round();
print(i1); // 13
print(i1.runtimeType); // int
int i2 = double2.round();
print(i2); // 3
print(i2.runtimeType); // int
}
``````
• ceil() method: returns the ceiling number which upper of a given int part. For example 9.5.round() returns 10.

Here is a `ceil() method example program`

``````    main() {
double double1 = 12.9;
double double2 = 3.4;

print(double1.runtimeType); // double
print(double2.runtimeType); // double

int i1 = double1.ceil();
print(i1); // 13
print(i1.runtimeType); // int
int i2 = double2.ceil();
print(i2); // 4
print(i2.runtimeType); // int
}
``````
• floor() method : returns the rounded floor number which is lower than a given int part. For example 9.5.round() returns 9.

Here is a `floor() method example program`

``````main() {
double double1 = 12.9;
double double2 = 3.4;

print(double1.runtimeType); // double
print(double2.runtimeType); // double

int i1 = double1.floor();
print(i1); // 12
print(i1.runtimeType); // int
int i2 = double2.floor();
print(i2); // 3
print(i2.runtimeType); // int
}

``````

All the above methods work in flutter programming to convert double to int.

## How to parse int to double in Dart or Flutter?

For example, an int value directly assigned to a double value gives the error A value of type ‘int’ can’t be assigned to a variable of type ‘double’. for a below code.

``````  int number = 10;
double dd=number;
``````

Following are multiple ways to convert int type to double in flutter or dart.

• use int toDouble method

toDouble() method of int can be assigned to double type. Here is an example:

``````main() {
int number = 10;
double d1 = number.toDouble();
print(d1); //10
print(d1.runtimeType); //10
}
``````
• double parse method

First, get the string version of a number, Next, pass this string to double.parse(), assigned to a double number Here is an example:

``````main() {
int number = 10;
double d1 = double.parse(number.toString());
print(d1); //10
}
``````
• use the divide operator with 1

This is simple and easy as all the division operation results in Double flutter.

Divide the integer number by 1 results in a double type value. Here is an example:

``````main() {
int number = 10;
double d1 = number/1;
print(d1); //10
}
``````

## Conclusion

To summarize, We can easily convert numeric types with built-in methods provided by int and double.

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