Scanner scanner = new Scanner(System.in);
System.out.print("Please input your height: ");
float height = scanner.nextFloat();
System.out.print("Please input your weight");
float weight = scanner.nextFloat();
float BMI = weight/(height*height);
if(BMI<18.5){

System.out.println("你的体重过轻");
} else if (BMI>=18.5&&BMI<25) {

System.out.println("你的体重正常");

} else if (BMI>=25&&BMI<28) {

System.out.println("你的体重过重");

} else if (BMI>=28&&BMI<=32) {

System.out.println("你的体重肥胖");

}

else {

System.out.println("你的体重非常肥胖");
}