I'm trying to get my program to continue asking for input and answering that input










0















I have this program here that reads a list of numbers from an input file, then asks the user to enter a number. The program then looks into the file and if the number that the user entered is in the file, it will display "This number is in the file" if the number is not in the file, the program will display, "Number is not in file." The program then has to keep asking the user to enter numbers and based on the number entered, the program needs to write back the appropriate response. The first time the user is asked to enter a number, the program works correctly and prints back the correct response, the problem is that after the program asks again to enter a number, it will print back the same response as the first number entered no matter what number is entered whether it's in the file or not. Are my while loops in the wrong place? Not sure how to fix this.



package classwork7_2;
import java.util.*;
import java.io.*;

public class ClassWork7_2

public static void main(String args)throws IOException

Scanner s = new Scanner(System.in);

int numbers = fileToArray();
Arrays.sort(numbers);

System.out.print("Enter a number in the file: ");
int numb = s.nextInt();

int i = Arrays.binarySearch(numbers, numb);

if(i < 0)
while(i < 0)
System.out.print("Number is not in filen");
System.out.print("Enter number in the file: ");
s.nextInt();



else if(i >= 0)
while(i >= 0)
System.out.print("This number is in the filen");
System.out.print("Enter number in the file: ");
s.nextInt();




public static int fileToArray() throws IOException

Scanner s = new Scanner(System.in);
int array = new int[7];

System.out.print("Enter name of file: ");
String filename = s.nextLine();

File f = new File(filename);
Scanner inputFile = new Scanner(f);
int i = 0;

while(inputFile.hasNext())

array[i] = inputFile.nextInt();
i++;

inputFile.close();
return array;











share|improve this question






















  • You need to assign the value. numb = s.nextInt() otherwise the binary search is always the same.

    – matt
    Nov 16 '18 at 7:46











  • Same with i. eg. replace s.nextInt() with, i = Arrays.binarySearch(numb, s.nextInt()); otherwise i never changes and you just keep doing the same thing.

    – matt
    Nov 16 '18 at 7:51















0















I have this program here that reads a list of numbers from an input file, then asks the user to enter a number. The program then looks into the file and if the number that the user entered is in the file, it will display "This number is in the file" if the number is not in the file, the program will display, "Number is not in file." The program then has to keep asking the user to enter numbers and based on the number entered, the program needs to write back the appropriate response. The first time the user is asked to enter a number, the program works correctly and prints back the correct response, the problem is that after the program asks again to enter a number, it will print back the same response as the first number entered no matter what number is entered whether it's in the file or not. Are my while loops in the wrong place? Not sure how to fix this.



package classwork7_2;
import java.util.*;
import java.io.*;

public class ClassWork7_2

public static void main(String args)throws IOException

Scanner s = new Scanner(System.in);

int numbers = fileToArray();
Arrays.sort(numbers);

System.out.print("Enter a number in the file: ");
int numb = s.nextInt();

int i = Arrays.binarySearch(numbers, numb);

if(i < 0)
while(i < 0)
System.out.print("Number is not in filen");
System.out.print("Enter number in the file: ");
s.nextInt();



else if(i >= 0)
while(i >= 0)
System.out.print("This number is in the filen");
System.out.print("Enter number in the file: ");
s.nextInt();




public static int fileToArray() throws IOException

Scanner s = new Scanner(System.in);
int array = new int[7];

System.out.print("Enter name of file: ");
String filename = s.nextLine();

File f = new File(filename);
Scanner inputFile = new Scanner(f);
int i = 0;

while(inputFile.hasNext())

array[i] = inputFile.nextInt();
i++;

inputFile.close();
return array;











share|improve this question






















  • You need to assign the value. numb = s.nextInt() otherwise the binary search is always the same.

    – matt
    Nov 16 '18 at 7:46











  • Same with i. eg. replace s.nextInt() with, i = Arrays.binarySearch(numb, s.nextInt()); otherwise i never changes and you just keep doing the same thing.

    – matt
    Nov 16 '18 at 7:51













0












0








0








I have this program here that reads a list of numbers from an input file, then asks the user to enter a number. The program then looks into the file and if the number that the user entered is in the file, it will display "This number is in the file" if the number is not in the file, the program will display, "Number is not in file." The program then has to keep asking the user to enter numbers and based on the number entered, the program needs to write back the appropriate response. The first time the user is asked to enter a number, the program works correctly and prints back the correct response, the problem is that after the program asks again to enter a number, it will print back the same response as the first number entered no matter what number is entered whether it's in the file or not. Are my while loops in the wrong place? Not sure how to fix this.



package classwork7_2;
import java.util.*;
import java.io.*;

public class ClassWork7_2

public static void main(String args)throws IOException

Scanner s = new Scanner(System.in);

int numbers = fileToArray();
Arrays.sort(numbers);

System.out.print("Enter a number in the file: ");
int numb = s.nextInt();

int i = Arrays.binarySearch(numbers, numb);

if(i < 0)
while(i < 0)
System.out.print("Number is not in filen");
System.out.print("Enter number in the file: ");
s.nextInt();



else if(i >= 0)
while(i >= 0)
System.out.print("This number is in the filen");
System.out.print("Enter number in the file: ");
s.nextInt();




public static int fileToArray() throws IOException

Scanner s = new Scanner(System.in);
int array = new int[7];

System.out.print("Enter name of file: ");
String filename = s.nextLine();

File f = new File(filename);
Scanner inputFile = new Scanner(f);
int i = 0;

while(inputFile.hasNext())

array[i] = inputFile.nextInt();
i++;

inputFile.close();
return array;











share|improve this question














I have this program here that reads a list of numbers from an input file, then asks the user to enter a number. The program then looks into the file and if the number that the user entered is in the file, it will display "This number is in the file" if the number is not in the file, the program will display, "Number is not in file." The program then has to keep asking the user to enter numbers and based on the number entered, the program needs to write back the appropriate response. The first time the user is asked to enter a number, the program works correctly and prints back the correct response, the problem is that after the program asks again to enter a number, it will print back the same response as the first number entered no matter what number is entered whether it's in the file or not. Are my while loops in the wrong place? Not sure how to fix this.



package classwork7_2;
import java.util.*;
import java.io.*;

public class ClassWork7_2

public static void main(String args)throws IOException

Scanner s = new Scanner(System.in);

int numbers = fileToArray();
Arrays.sort(numbers);

System.out.print("Enter a number in the file: ");
int numb = s.nextInt();

int i = Arrays.binarySearch(numbers, numb);

if(i < 0)
while(i < 0)
System.out.print("Number is not in filen");
System.out.print("Enter number in the file: ");
s.nextInt();



else if(i >= 0)
while(i >= 0)
System.out.print("This number is in the filen");
System.out.print("Enter number in the file: ");
s.nextInt();




public static int fileToArray() throws IOException

Scanner s = new Scanner(System.in);
int array = new int[7];

System.out.print("Enter name of file: ");
String filename = s.nextLine();

File f = new File(filename);
Scanner inputFile = new Scanner(f);
int i = 0;

while(inputFile.hasNext())

array[i] = inputFile.nextInt();
i++;

inputFile.close();
return array;








java arrays






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 16 '18 at 7:43









Matt L.Matt L.

278




278












  • You need to assign the value. numb = s.nextInt() otherwise the binary search is always the same.

    – matt
    Nov 16 '18 at 7:46











  • Same with i. eg. replace s.nextInt() with, i = Arrays.binarySearch(numb, s.nextInt()); otherwise i never changes and you just keep doing the same thing.

    – matt
    Nov 16 '18 at 7:51

















  • You need to assign the value. numb = s.nextInt() otherwise the binary search is always the same.

    – matt
    Nov 16 '18 at 7:46











  • Same with i. eg. replace s.nextInt() with, i = Arrays.binarySearch(numb, s.nextInt()); otherwise i never changes and you just keep doing the same thing.

    – matt
    Nov 16 '18 at 7:51
















You need to assign the value. numb = s.nextInt() otherwise the binary search is always the same.

– matt
Nov 16 '18 at 7:46





You need to assign the value. numb = s.nextInt() otherwise the binary search is always the same.

– matt
Nov 16 '18 at 7:46













Same with i. eg. replace s.nextInt() with, i = Arrays.binarySearch(numb, s.nextInt()); otherwise i never changes and you just keep doing the same thing.

– matt
Nov 16 '18 at 7:51





Same with i. eg. replace s.nextInt() with, i = Arrays.binarySearch(numb, s.nextInt()); otherwise i never changes and you just keep doing the same thing.

– matt
Nov 16 '18 at 7:51












3 Answers
3






active

oldest

votes


















2














Try this



public static void main(String args)throws IOException 

Scanner s = new Scanner(System.in);

int numbers = fileToArray();
Arrays.sort(numbers);
while(true)
System.out.print("Enter a number in the file: ");
int numb = s.nextInt();

int i = Arrays.binarySearch(numbers, numb);

if (i < 0)
System.out.print("Number is not in filen");
else if (i >= 0)
System.out.print("This number is in the filen");









share|improve this answer
































    1














    The problem is that you don't peform search after second input, so old result is printed out. You must re-assign user input and perform search for every input:



    for(;;) // infinite loop
    System.out.println("Number is not in file");
    num = s.nextInt(); // re-read user input
    int i = Arrays.binarySearch(numbers, numb); // search again based on input
    if (i < 0)
    System.out.println("Number is not in filen");
    else
    System.out.print("This number is in the filen");







    share|improve this answer






























      1














      Just remove the first input and do everything in the loop. The main will become:



      public static void main(String args) throws IOException 
      Scanner s = new Scanner(System.in);
      int numbers = fileToArray();
      Arrays.sort(numbers);

      while (true)
      System.out.print("Enter a number in the file: ");
      int numb = s.nextInt();
      int i = Arrays.binarySearch(numbers, numb);
      if (i < 0)
      System.out.print("Number is not in filen");
      else
      System.out.print("Number is in filen");





      The problem is you don't have exit condition - it will ask forever. You might think for something ;)






      share|improve this answer























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        3 Answers
        3






        active

        oldest

        votes








        3 Answers
        3






        active

        oldest

        votes









        active

        oldest

        votes






        active

        oldest

        votes









        2














        Try this



        public static void main(String args)throws IOException 

        Scanner s = new Scanner(System.in);

        int numbers = fileToArray();
        Arrays.sort(numbers);
        while(true)
        System.out.print("Enter a number in the file: ");
        int numb = s.nextInt();

        int i = Arrays.binarySearch(numbers, numb);

        if (i < 0)
        System.out.print("Number is not in filen");
        else if (i >= 0)
        System.out.print("This number is in the filen");









        share|improve this answer





























          2














          Try this



          public static void main(String args)throws IOException 

          Scanner s = new Scanner(System.in);

          int numbers = fileToArray();
          Arrays.sort(numbers);
          while(true)
          System.out.print("Enter a number in the file: ");
          int numb = s.nextInt();

          int i = Arrays.binarySearch(numbers, numb);

          if (i < 0)
          System.out.print("Number is not in filen");
          else if (i >= 0)
          System.out.print("This number is in the filen");









          share|improve this answer



























            2












            2








            2







            Try this



            public static void main(String args)throws IOException 

            Scanner s = new Scanner(System.in);

            int numbers = fileToArray();
            Arrays.sort(numbers);
            while(true)
            System.out.print("Enter a number in the file: ");
            int numb = s.nextInt();

            int i = Arrays.binarySearch(numbers, numb);

            if (i < 0)
            System.out.print("Number is not in filen");
            else if (i >= 0)
            System.out.print("This number is in the filen");









            share|improve this answer















            Try this



            public static void main(String args)throws IOException 

            Scanner s = new Scanner(System.in);

            int numbers = fileToArray();
            Arrays.sort(numbers);
            while(true)
            System.out.print("Enter a number in the file: ");
            int numb = s.nextInt();

            int i = Arrays.binarySearch(numbers, numb);

            if (i < 0)
            System.out.print("Number is not in filen");
            else if (i >= 0)
            System.out.print("This number is in the filen");










            share|improve this answer














            share|improve this answer



            share|improve this answer








            edited Nov 16 '18 at 9:07

























            answered Nov 16 '18 at 7:54









            flopcoderflopcoder

            777513




            777513























                1














                The problem is that you don't peform search after second input, so old result is printed out. You must re-assign user input and perform search for every input:



                for(;;) // infinite loop
                System.out.println("Number is not in file");
                num = s.nextInt(); // re-read user input
                int i = Arrays.binarySearch(numbers, numb); // search again based on input
                if (i < 0)
                System.out.println("Number is not in filen");
                else
                System.out.print("This number is in the filen");







                share|improve this answer



























                  1














                  The problem is that you don't peform search after second input, so old result is printed out. You must re-assign user input and perform search for every input:



                  for(;;) // infinite loop
                  System.out.println("Number is not in file");
                  num = s.nextInt(); // re-read user input
                  int i = Arrays.binarySearch(numbers, numb); // search again based on input
                  if (i < 0)
                  System.out.println("Number is not in filen");
                  else
                  System.out.print("This number is in the filen");







                  share|improve this answer

























                    1












                    1








                    1







                    The problem is that you don't peform search after second input, so old result is printed out. You must re-assign user input and perform search for every input:



                    for(;;) // infinite loop
                    System.out.println("Number is not in file");
                    num = s.nextInt(); // re-read user input
                    int i = Arrays.binarySearch(numbers, numb); // search again based on input
                    if (i < 0)
                    System.out.println("Number is not in filen");
                    else
                    System.out.print("This number is in the filen");







                    share|improve this answer













                    The problem is that you don't peform search after second input, so old result is printed out. You must re-assign user input and perform search for every input:



                    for(;;) // infinite loop
                    System.out.println("Number is not in file");
                    num = s.nextInt(); // re-read user input
                    int i = Arrays.binarySearch(numbers, numb); // search again based on input
                    if (i < 0)
                    System.out.println("Number is not in filen");
                    else
                    System.out.print("This number is in the filen");








                    share|improve this answer












                    share|improve this answer



                    share|improve this answer










                    answered Nov 16 '18 at 7:52









                    Alex SalauyouAlex Salauyou

                    11.3k43662




                    11.3k43662





















                        1














                        Just remove the first input and do everything in the loop. The main will become:



                        public static void main(String args) throws IOException 
                        Scanner s = new Scanner(System.in);
                        int numbers = fileToArray();
                        Arrays.sort(numbers);

                        while (true)
                        System.out.print("Enter a number in the file: ");
                        int numb = s.nextInt();
                        int i = Arrays.binarySearch(numbers, numb);
                        if (i < 0)
                        System.out.print("Number is not in filen");
                        else
                        System.out.print("Number is in filen");





                        The problem is you don't have exit condition - it will ask forever. You might think for something ;)






                        share|improve this answer



























                          1














                          Just remove the first input and do everything in the loop. The main will become:



                          public static void main(String args) throws IOException 
                          Scanner s = new Scanner(System.in);
                          int numbers = fileToArray();
                          Arrays.sort(numbers);

                          while (true)
                          System.out.print("Enter a number in the file: ");
                          int numb = s.nextInt();
                          int i = Arrays.binarySearch(numbers, numb);
                          if (i < 0)
                          System.out.print("Number is not in filen");
                          else
                          System.out.print("Number is in filen");





                          The problem is you don't have exit condition - it will ask forever. You might think for something ;)






                          share|improve this answer

























                            1












                            1








                            1







                            Just remove the first input and do everything in the loop. The main will become:



                            public static void main(String args) throws IOException 
                            Scanner s = new Scanner(System.in);
                            int numbers = fileToArray();
                            Arrays.sort(numbers);

                            while (true)
                            System.out.print("Enter a number in the file: ");
                            int numb = s.nextInt();
                            int i = Arrays.binarySearch(numbers, numb);
                            if (i < 0)
                            System.out.print("Number is not in filen");
                            else
                            System.out.print("Number is in filen");





                            The problem is you don't have exit condition - it will ask forever. You might think for something ;)






                            share|improve this answer













                            Just remove the first input and do everything in the loop. The main will become:



                            public static void main(String args) throws IOException 
                            Scanner s = new Scanner(System.in);
                            int numbers = fileToArray();
                            Arrays.sort(numbers);

                            while (true)
                            System.out.print("Enter a number in the file: ");
                            int numb = s.nextInt();
                            int i = Arrays.binarySearch(numbers, numb);
                            if (i < 0)
                            System.out.print("Number is not in filen");
                            else
                            System.out.print("Number is in filen");





                            The problem is you don't have exit condition - it will ask forever. You might think for something ;)







                            share|improve this answer












                            share|improve this answer



                            share|improve this answer










                            answered Nov 16 '18 at 7:54









                            Veselin DavidovVeselin Davidov

                            5,9551718




                            5,9551718



























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