Thread: Files and arrays

Practicing a lot of java and testing my codes until I become better at it.

Am reading records from a txt file and storing it into an array

import java.util.*;
import java.io.*;
 
public class PatientExercise {
	//patients exercise time
	public static void main (String[]args) throws IOException{
		Scanner in = new Scanner(new FileReader("values.txt"));
		double [] patientTimeRecords = new double [300];
		int noExerciseCount=0, numPatients =0;
		double highest=0, lowest=0, avg=0, totalTime=0;
 
		//iniitializing the array
		for(int i = 0; i < patientTimeRecords.length; i++)
			patientTimeRecords[i] = 0.0;
 
 
    	int i=0;
		patientTimeRecords[i] = in.nextDouble();
		//double []patientTime = double
		while(patientTimeRecords[i] >= 0)
		{
			totalTime = totalTime + patientTimeRecords[i];
 
			//counts number of times patient didn't exercise
			if (patientTimeRecords[i] == 0)
			{
				noExerciseCount++;
			}
	        //finds and updates highest exercise time
			if (patientTimeRecords[i] > highest)
			{
				highest=patientTimeRecords[i];
			}
			 //finds and updates lowest exercise time
			if (patientTimeRecords[i] < lowest)
			{
				lowest=patientTimeRecords[i];
			}
 
			 numPatients++;
			 patientTimeRecords[i]= in.nextDouble();
		}//end while
 
		avg =totalTime/numPatients;
		System.out.printf("Highest Time: %2.2f\n", highest);
		System.out.printf("Lowest Time: %2.2f\n", lowest);
		System.out.printf("Average Time: %2.2f\n", avg);
		System.out.printf("Number of times patient did not exeercise: %2.2f\n", noExerciseCount);	
 
 
	}
}

However an error msg keeps popping up:
Exception in thread "main" java.util.NoSuchElementException
at java.util.Scanner.throwFor(Scanner.java:907)
at java.util.Scanner.next(Scanner.java:1530)
at java.util.Scanner.nextDouble(Scanner.java:2456)
at pastpapers.PatientExercise.main(PatientExercise.ja va:44)

line 44 is:patientTimeRecords[i]= in.nextDouble();

Hi, i incremented the i by replacing the:
patientTimeRecords[i]= in.nextDouble();
TO
patientTimeRecords[i]++;

But, my output screen is blank

still not getting it to wrk :/ i ended up placing the for loop in the while and it created more problems.

import java.util.*;
import java.io.*;
 
public class PatientExercise {
	//patients exercise time
	public static void main (String[]args) throws IOException{
		Scanner in = new Scanner(new FileReader("values.txt"));
		double [] patientTimeRecords = new double [300];
		int noExerciseCount=0, numPatients =0;
		double highest=0, lowest=0, avg=0, totalTime=0;
 
		//iniitializing the array
		//for(int i = 0; i < patientTimeRecords.length; i++)
			//patientTimeRecords[i] = 0.0;
 
         int i=0;
    	//reads patient time from records
		patientTimeRecords[i] = in.nextDouble();
	    //file ends when number is negative
		while(patientTimeRecords[i] >= 0)
		{
 
			for(int i = 0; i < patientTimeRecords.length; i++)
			{
				patientTimeRecords[i] = in.nextDouble();
 
			totalTime = totalTime + patientTimeRecords[i];
 
			//counts number of times patient didn't exercise
			if (patientTimeRecords[i] == 0)
			{
				noExerciseCount++;
			}
	        //finds and updates highest exercise time
			if (patientTimeRecords[i] > highest)
			{
				highest=patientTimeRecords[i];
			}
			 //finds and updates lowest exercise time
			if (patientTimeRecords[i] < lowest)
			{
				lowest=patientTimeRecords[i];
			}
			}
			 numPatients++;
			 patientTimeRecords[i]=in.nextDouble();
		}//end while
 
		avg =totalTime/numPatients;
		System.out.printf("Highest Time: %2.2f\n", highest);
		System.out.printf("Lowest Time: %2.2f\n", lowest);
		System.out.printf("Average Time: %2.2f\n", avg);
		System.out.printf("Number of times patient did not exeercise: %2.2f\n", noExerciseCount);	
 
 
	}
}

the for loop said i is duplicate but when i remove 1=0 before the while loop, the program says i cannot be resolved as variable.

Exception in thread "main" java.lang.Error: Unresolved compilation problem:
Duplicate local variable i

at pastpapers.PatientExercise.main(PatientExercise.ja va:25)
line 25:the for loop line

yup, everytime I adjust something, another problem arises. Nevermind