How to implement Body Mass Index (BMI)in Java

My problem is how can I implement without the Scanner method and with Math.round and Math.pow?

Here is my code:

```import java.util.Scanner;
public class BMI{
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
System.out.print("Input weight in kilogram: ");
double weight = sc.nextDouble();
System.out.print("nInput height in meters: ");
double height = sc.nextDouble();
double BMI = weight / (height * height);
System.out.print("nThe Body Mass Index (BMI) is " + BMI + " kg/m2");
}
}
```

My another idea was It is only for a certain value. In my case with a weight of 75.0 and size 178.0

```public static void main(String args[]) {

double weight = 75.0;
double height = 178.0;

double BMI = weight / (height * height);
System.out.print("nThe Body Mass Index (BMI) is " + BMI + " kg/m2");
}
```

It’s up to developer to choose how to initialize parameters.
If don’t want to use scanner the simple way is just add directly.
Initialize can also come from various data-sources: database, file (xml,text), web-service, etc.
For school purpose maybe you could try to build a BMI class and use constructor to pass whatever parameters may want.
Advantage to have a constructor with parameters is that you can build various BMI instances with different result(based on params), not just have only 1 result in for all the class-instances (due to the fact the input is the same).

eg:

```public class BMI
{
double BMI;
public BMI(double weight,double height )
{
this.BMI = weight / (height * height);
}

public String toString()
{
return "nThe Body Mass Index (BMI) is " + this.BMI + " kg/m2";
}

public static void main(String args[])
{
BMI test1 = new BMI(100,1.90);
BMI test2 = new BMI(68.77,1.60);
System.out.println(test1);
System.out.println(test2);
}
}
```

Output:

```The Body Mass Index (BMI) is 27.70083102493075 kg/m2
The Body Mass Index (BMI) is 26.863281249999993 kg/m2
```
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