Basic Java: method calculation returns NaN -


i'm learning java having difficulty creating method calculates body mass index. doesn't accept instance variables declared earlier in program , i'm not sure how fix this. appreciated!

code:

import java.util.formatter; public class healthrecord {      // initialise instance variables      string first;     string last;     double height;     double weight;      public healthrecord(string lastname, string firstname, double height, double weight)     {         first = firstname;         last = lastname;         height = height;         weight = weight;      }       public static void main(string args[]) {          healthrecord record = new healthrecord("last", "first", 72, 150);         system.out.println("bmi="+record.getbmi());     }        // calculate bmi     public double getbmi() {         double bmi = weight / (height * height) * 703.0;         return bmi;     }  }

result: bmi=nan

update constructor below:

public healthrecord(string lastname, string firstname, double height, double weight)   {     first = firstname;     last = lastname;     this.height = height;     this.weight = weight;    }

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