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Alright this loop problem is bugging me

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Join Date: Feb 2006

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Stoney

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Alright this loop problem is bugging me

May 13th, 2007

I can't figure out a way to have this program continue to loop if you press any number other than 1 or 2.

Here's the test appilcation.

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public class AnalysisTest
{
   public static void main( String args[] )
   {
      Analysis application = new Analysis(); // create Analysis object
      application.processExamResults(); // call method to process results
   } // end main
 
} // end class AnalysisTest
public class AnalysisTest
{
   public static void main( String args[] )
   {
      Analysis application = new Analysis(); // create Analysis object
      application.processExamResults(); // call method to process results
   } // end main

} // end class AnalysisTest

My problem is in the class below.

This is what i have so far. Im thinking of putting this in there replace the if statement.

if ( result == 0 )
continue;
if ( result >= 3 )
continue;
if ( failures == 0 )
continue;
if ( failures >= 3 )
continue;

if ( result == 1 ) // if result 1,
passes = passes + 1; // increment passes;
else ( failures == 2 ) // else result is not 1, so
failures = failures + 1; // increment failures

I can't figure it out for some reason

I did this in BASIC and I can't remember how.

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import java.util.Scanner;
public class Analysis
{
   public void processExamResults()
   {
      // create Scanner to obtain input from command window
      Scanner input = new Scanner( System.in );
 
      // initializing variables in declarations
      int passes = 0; // number of passes
      int failures = 0; // number of failures
      int studentCounter = 1; // student counter
      int result; // one exam result (obtains value from user)
 
      // process 10 students using counter-controlled loop
      while ( studentCounter <= 10 )
      {
         // prompt user for input and obtain value from user
         System.out.print( "Enter result (1 = pass, 2 = fail): " );
         result = input.nextInt();
 
         // if...else nested in while
         if ( result == 1 )          // if result 1,
            passes = passes + 1;     // increment passes;
         else                        // else result is not 1, so
            failures = failures + 1; // increment failures
 
         // increment studentCounter so loop eventually terminates
         studentCounter = studentCounter + 1;
      } // end while
 
      // termination phase; prepare and display results
      System.out.printf( "Passed: %d\nFailed: %d\n", passes, failures );
 
      // determine whether more than 8 students passed
      if ( passes > 8 )
         System.out.println( "Raise Tuition" );
   } // end method processExamResults
 
} // end class Analysis
import java.util.Scanner;
public class Analysis
{
   public void processExamResults()
   {
      // create Scanner to obtain input from command window
      Scanner input = new Scanner( System.in );

      // initializing variables in declarations
      int passes = 0; // number of passes
      int failures = 0; // number of failures
      int studentCounter = 1; // student counter
      int result; // one exam result (obtains value from user)

      // process 10 students using counter-controlled loop
      while ( studentCounter <= 10 )
      {
         // prompt user for input and obtain value from user
         System.out.print( "Enter result (1 = pass, 2 = fail): " );
         result = input.nextInt();

         // if...else nested in while
         if ( result == 1 )          // if result 1,
            passes = passes + 1;     // increment passes;
         else                        // else result is not 1, so
            failures = failures + 1; // increment failures

         // increment studentCounter so loop eventually terminates
         studentCounter = studentCounter + 1;
      } // end while

      // termination phase; prepare and display results
      System.out.printf( "Passed: %d\nFailed: %d\n", passes, failures );

      // determine whether more than 8 students passed
      if ( passes > 8 )
         System.out.println( "Raise Tuition" );
   } // end method processExamResults

} // end class Analysis

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Join Date: Apr 2007

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lucky1981_iway lucky1981_iway is offline

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Re: Alright this loop problem is bugging me

May 13th, 2007

First thing you didn't do anything in your code so that it exit if anybody enter "result > 2" So it loops until 10 times and after that it exit.
Replace your existing code with this

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if (result == 1) // if result 1,
passes = passes + 1; // increment passes;
else if(result == 2)
{// else result is not 1, so
failures = failures + 1; // increment failures
}
else
break;

Now it will exit from loop if any body enters other then 1 or 2.

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Join Date: Feb 2006

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Stoney

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Re: Alright this loop problem is bugging me

May 13th, 2007

Actually what I'm trying to figure out is how to keep the loop going even if you enter other numbers in.

Last edited by Stoney; May 13th, 2007 at 11:05 pm.

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Stoney

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Re: Alright this loop problem is bugging me

May 13th, 2007

I just replaced break with continue.

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 if (result == 1) // if result 1,
 
		    passes = passes + 1; // increment passes;
 
		 else if(result == 2) {
 
		    failures = failures + 1; // increment failures
 
		    } else
 
		        continue;
 if (result == 1) // if result 1,

		    passes = passes + 1; // increment passes;

		 else if(result == 2) {

		    failures = failures + 1; // increment failures

		    } else

		        continue;

Your code you gave me somehow commented the failures = failures +1 so at first it wasnt incrementing that.

I think I got it. Right?

Last edited by Stoney; May 13th, 2007 at 11:11 pm.

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Join Date: Apr 2007

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Reputation: deng_cen is an unknown quantity at this point

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deng_cen

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Re: Alright this loop problem is bugging me

May 14th, 2007

hi,
Maybe this code can help you.

package com.prom1;
import java.util.Scanner;
public class AnalysisTest {
public static void main(String args[]) {
Analysis application = new Analysis(); // create Analysis object
application.processExamResults(); // call method to process results
} // end main
} // end class AnalysisTest
class Analysis {
public void processExamResults() {
// create Scanner to obtain input from command window
// initializing variables in declarations
int passes = 0; // number of passes
int failures = 0; // number of failures
int studentCounter = 1; // student counter
int result; // one exam result (obtains value from user)
Scanner input = new Scanner(System.in);
// process 10 students using counter-controlled loop
while (studentCounter <= 10) {
// prompt user for input and obtain value from user
System.out.print("Enter result (1 = pass, 2 = fail): ");
result = input.nextInt();
// if...else nested in while
if (result == 1) {// if result 1,
passes = passes + 1; // increment passes;
studentCounter = studentCounter + 1;
continue;
} else if (result == 2) {
// else result is not 1, so
failures = failures + 1; // increment failures
studentCounter = studentCounter + 1;
continue;
} else {
System.out.println("that is wrong! Please input number again!");
continue;
}
// increment studentCounter so loop eventually terminates
} // end while3
// termination phase; prepare and display results
System.out.printf("Passed: %d\nFailed: %d\n", passes, failures);
// determine whether more than 8 students passed
if (passes > 8)
System.out.println("Raise Tuition");
} // end method processExamResults
} // end class Analysis

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Join Date: Dec 2004

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peter_budo peter_budo is offline

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Re: Alright this loop problem is bugging me

May 14th, 2007

@deng_cen please use tags to insert code into post. It is the hash"#" sign in toolbar above the text area for reply.

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The continue statement, when executed in a while, for or do...while, skips remaining statements in the loop body and process with next iteration of the loop. In while and do...while statements, the program evaluates the loop-ontinuation test immidiately after the continue statement executes. In a for statement, the increment expression executes, then the program evalues the loop-continuation test.

I hate to look into Deitel&Deitel book to get you proper explanation to make it clear as I may get on rants to explain what the continue is for. In your case continue is not neccesary as you do not have any commands after continue in your if/else checks so you can remove them. Example bellow will show when continue statement is usefull

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for(int count =1; count <= 10; count++)
{
     if(count == 5)
     continue;
 
     //this meessage will not be printed if count == 5
     System.out.printf("%d", count); 
}
for(int count =1; count <= 10; count++)
{
     if(count == 5)
     continue;

     //this meessage will not be printed if count == 5
     System.out.printf("%d", count); 
}

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Join Date: Feb 2006

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Stoney

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Re: Alright this loop problem is bugging me

May 14th, 2007

So the way I have it. Is that ok?

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Re: Alright this loop problem is bugging me

May 14th, 2007

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Originally Posted by Stoney

So the way I have it. Is that ok?

as long you don't do it as the code from deng_cen shows you alright

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if (result == 1) {// if result 1,
passes = passes + 1; // increment passes;
studentCounter = studentCounter + 1;
continue;
}
if (result == 1) {// if result 1,
passes = passes + 1; // increment passes;
studentCounter = studentCounter + 1;
continue;
}

there is no reason for continue, no other commands in the if/else statement after continue

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Stoney

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Re: Alright this loop problem is bugging me

May 14th, 2007

I understand that but is there another way to do the problem without adding continue to it at all?

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Re: Alright this loop problem is bugging me

#10

May 14th, 2007

yes you have it there, appropriate increment inside if/else statement

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if (result == 1) {// if result 1,
passes = passes + 1; // increment passes;
studentCounter = studentCounter + 1;
} 
else if (result == 2) {// if result 2,
failures = failures + 1;
studentCounter = studentCounter + 1;
continue;
}

So studentCounter will be incremented only if the mark is 1 or 2