Thread: Player input not working

Thank you for replying! If you mean by slipt it into an array I'm not allowed to do that or use regex.

Originally Posted by Norm

Another option - have the user only enter one number at a time.
Otherwise describe how your instructor expects the program to get the user's input.

He said to use substring.

Originally Posted by Norm

Ok. To use substring you need to know what columns to access. Did he say how to determine what columns to use with the substring method?
There are several useful methods in the String class:
indexOf to find the first space
lastIndexOf to find the last space

I assume there could be more than one space between the numbers.

Read the API doc for the class to see what they can do.

something about fetching the words height and weight for a substring?
for example:
int space = weight.indexOf(' ');
int bar = height.indexOf(' ');

no it doesn't work >.<

here's the error: "Exception in thread "main" java.lang.NumberFormatException: For input string: "59 1.72"
at java.base/jdk.internal.math.FloatingDecimal.readJavaFormatSt ring(FloatingDecimal.java:2054)
at java.base/jdk.internal.math.FloatingDecimal.parseDouble(Floa tingDecimal.java:110)
at java.base/java.lang.Double.parseDouble(Double.java:549)
at com.company.Main.main(Main.java:30)"

Originally Posted by Norm

"Exception in thread "main" java.lang.NumberFormatException: For input string: "59 1.72"

That looks like the original problem.

Did you use substring to get the two numbers from the input String?
Add some print statements that print out the two String values so you can see if the substring code was working.
When the two extracted Strings look good then try passing each one of them to the parseDouble method one at a time.

something like this?

String first = height.substring(0, space);

I get this error "Exception in thread "main" java.lang.StringIndexOutOfBoundsException: begin 0, end -1, length 5"

My mad I forgot to add numbers based on their position like this
String first = height.substring(0, 5);

String third = weight.substring(0, 4);

No but it helped me figure it out so it can write out height and weight in the terminal but now I have to make a string with both weight and height

int space = s.indexOf(' ');
int bar = s.lastIndexOf(' ');
String first = s.substring(space-2, space);

String third = s.substring(space, space+5);
System.out.println(third);

It seems like the issue lies in how you're trying to parse the input string for height and weight. The error message suggests that it's having trouble converting the string "1.72 59" into a number, likely because it's expecting just one number rather than two separated by a space.

Here's a revised version of your code that should work:

```java
import javax.swing.JOptionPane;

public class Main {
public static void main(String[] args) {
String input = JOptionPane.showInputDialog("Enter height and weight (separated by a space):");

// Split the input string into height and weight
String[] parts = input.split(" ");
double height = Double.parseDouble(parts[0]);
double weight = Double.parseDouble(parts[1]);

// Calculate BMI
double bmi = calculateBMI(height, weight);

// Display the result
JOptionPane.showMessageDialog(null, "Your BMI is: " + bmi);
}

// Function to calculate BMI
public static double calculateBMI(double height, double weight) {
// Convert height from meters to centimeters
height /= 100;
// Calculate BMI
return weight / (height * height);
}
}
```

This code uses `split()` to separate the input string into two parts (height and weight), then converts them into numbers separately. Also, I've adjusted the BMI calculation logic assuming you want the BMI formula (weight / height^2) based on the metric system (height in meters, weight in kilograms).

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