My scanner skips over my next double and next integer?

Question

Whenever I'm running my scanner it skips over the height(double) loop after weight. It also skips over the level(int) loop after age.

Here's my scanner class.

import java.util.Scanner;

 public class HowHealthy
 {
   public static void main(String[] args)
    {
   String aGender = "";

   //New healthy objec tis created
   Healthy person = new Healthy();

   //Scanner object is created
   Scanner in = new Scanner(System.in);

   String name = "";
   while(!person.setName(name))
   {
       System.out.print("Person's name: ");
       name = in.nextLine();
       if(!person.setName(name))
       {
           System.out.println("Invalid name - must be at least one character!");
       }
   }

   char gender = '\0';
   while(!person.setGender(gender))
   {
       System.out.print(name + ", are you male of female (M/F): ");
       gender = in.nextLine().toUpperCase().charAt(0);
       if(!person.setGender(gender))
       {
           System.out.println("Invalid gender - must be M or F (upper or lower case)":
       }
    }

   double weight = 0;
   while(!person.setWeight(weight))
   {
       System.out.print(name + "'s weight (pounds): ");
       weight = in.nextDouble();
       in.nextLine();
       if(!person.setWeight(weight))
       {
           System.out.println("Invalid weight - must be at least 100 pounds!");
       }
    }

   double height = 0;
   while(!person.setHeight(height))
   {
       System.out.print(name + "'s height (inches): ");
       height = in.nextDouble();
       if(!person.setHeight(height))
       {
           System.out.println("Invalid height - must be 60..84, inclusively!");
       }
   }

   int age = 0;
   while(!person.setAge(age))
   {
       System.out.print(name + "'s age (years): ");
       age = in.nextInt();
       in.nextLine();
       if(!person.setAge(age))
       {
           System.out.println("Invalid age - must be at least 18!");
        }
   }

   System.out.println();

   System.out.println("Activity Level: Use these categories:");
   System.out.println("\t1 - Sedentary (little or no exercise, desk job)");
   System.out.println("\t2 - Lightly active (little exercise / sports 3-5 days/wk");
   System.out.println("\t3 - Moderately active(moderate exercise / sports 3-5
   System.out.println("\t4 - Very active (hard exercise / sports 6 -7 day/wk)");
   System.out.println("\t5 - Extra active (hard daily exercise / sports \n\t physica2X)

    int level = 0;
   while(!person.setLevel(level))
   {
       System.out.print("How active are you? ");
       level = in.nextInt();
       if(!person.setLevel(level))
       {
           System.out.println("Invalid acitvity level - must be 1..5, inclusively!");
        }
   }


   System.out.println();

   //Creates a new Healthy object and prints values based on user's input

   System.out.println(person.getName()+ "'s information");
   System.out.printf("Weight: %.1f %s \n", person.getWeight(), "pounds");
   System.out.printf("Height: %.1f %s \n", person.getHeight(), "inches");
   System.out.println("Age: " + person.getAge() + " years");

   if (gender == 'M')
   {
      aGender = "male";
   }      
   else
   {
      aGender = "female";
   }
   System.out.println("These are for a " + aGender);
   System.out.println();

   //Calculates the person's BMR, BMI and TDEE based on user input
   System.out.printf("BMR is %.2f \n", person.calcBMR());
   System.out.printf("BMI is %.2f \n", person.calcBMI());
   System.out.printf("TDEE is %.2f \n", person.calcTDEE());

   //Determines person's weight status based on BMI calculated
   double BMI = person.calcBMI();

   //Displays person's weight status
   System.out.println("Your BMI classifies you as " + person.calcWeightStatus());  

    }
   }

Here is my scanner class.

score 1 · Answer 1 · answered Oct 24 '13 at 02:45

1

In both cases, you're missing in.nextLine() after you do in.nextInt(). If all of the other lines of code are working using things like in.nextDouble() followed by in.nextLine() my guess is that's what's missing.

answered Oct 24 '13 at 02:45

Jason Lowenthal

770
1
5
16

in.nextLine() does not work either – user2840682 Oct 24 '13 at 02:52
I'd recommend looking at what Sotirios Delimanolis posted, because it appears that they were running into similar problems. Looks like the newline character '/n' might be to blame. – Jason Lowenthal Oct 24 '13 at 02:56

score 0 · Answer 2 · answered Oct 24 '13 at 03:15

Since it is skipping over the loops completely, there is something wrong with your methods for setHeight() and setLevel().

while(!person.setHeight(height))

If it is skipping this loop, it must mean that setHeight(height) is returning true when it should be returning false, or you need to get rid of the '!'

My scanner skips over my next double and next integer?

2 Answers2