Help I can't run it what is wrong?

Question

https://code.sololearn.com/ci3Ng9ZMqQO6/?ref=app

Answer 1

calculate max heart rate as:
220 - age

TargetHeartRate() returns one value
so you can calculate middle value between
50% and 80% and use it as value of variable range

or calculate 50% and 80% of max heart rate separately
and print two numbers as target range of bpm

if you need double result use decimal dot in one number
(50/100.0)

you need main method eg
public static void main(String[] args) {
var hr = new heartrate("John","Doe", 10,6,2000);
System.out.printf("%.2f bpm\n", hr.TargetHeartRate() );
}

Answer 2

1.are you trying to do without main method:((
2.you didn't input any or print output statement for target heart beat rate
3 check the braces u didn't close.

Answer 3

reformat your code like this and it will get alot easier to find errors
https://code.sololearn.com/cqsMEHQ2Zrzu/?ref=app