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typecasting in java is a process of converting a variable from one data type to another. when you want to convert a `double` to an `int`, you are essentially truncating the decimal part of the `double` value, as `int` can only hold whole numbers.

typecasting from `double` to `int`

in java, you can convert a `double` to an `int` either by using:
1. **explicit casting (typecasting)**: this is done by putting the desired data type in parentheses before the value to be converted.
2. **using wrapper classes**: you can also use the `double` class to convert the double to an `int`.

explicit casting

when you perform explicit casting from `double` to `int`, any fractional part of the double number is discarded. for example, if you have a `double` value of `5.99`, casting it to an `int` will result in `5`.

#### example

here’s a simple example demonstrating explicit casting:



output



using wrapper classes

you can also convert a `double` to an `int` using the `double` wrapper class and its methods. however, this usually involves more steps than explicit casting.

#### example using `double` class



output



important points to remember

1. **truncation**: when you cast a `double` to an `int`, the decimal part is truncated, not rounded. if you want to round the value, you should use `math.round()` before casting.

2. **range of values**: be aware of the range of the `int` type in java. an `int` can hold values from -2,147,483,648 to 2,147,483,647. if the `double` value exceeds this range, it will lead to data loss or errors.

3. **performance**: typecasting is generally efficient, but if you're performing a large number of conversions, consider the context where you're doing them to avoid unnecessary overhead.

this tutorial should provide you with a solid understanding of how to typecast a `double` to an `int` in java, along with code examples to illustrate the process.

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