Java - cannot find symbol


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Feb 12, 2011
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Hi People,

When creating this program, I am trying to add a while loop so that I can continue to pull in input from the user until they put a -1 for the input. This is the error I get.

java:46: cannot find symbol
symbol : variable input
location: class GradesFour
String[] studs = input.split("\\s+");

With the arrow pointing to input. Normally I would know how to answer this but the input variable is already initialized! Please assist. See below.

import java.util.*;

public class GradesFour
{
public static void main(String[] args)
{
int total = 0;
int numberOfAs = 0;
int numberOfBs = 0;
int numberOfCs = 0;
int numberOfDs = 0;
int numberOfFs = 0;
int studsCount = 0;
int maxA = -1;
int maxB = -1;
int maxC = -1;
int maxD = -1;
int maxF = -1;
int minA = 101;
int minB = 101;
int minC = 101;
int minD = 101;
int minF = 101;
double aScore = 0;
double bScore = 0;
double cScore = 0;
double dScore = 0;
double fScore = 0;

boolean finished = false;
Scanner keyboard = new Scanner(System.in);
while(!finished)
{
System.out.println("Please enter a list of exam scores (-1 to end input)");
String input = keyboard.next();
if(input.equals(-1));{
finished = true;
}
}
String[] studs = input.split("\\s+"); //Setting a delimiter to separate the string.
System.out.println(" Statistics");
System.out.println("------------------------------");

int grade = 0;
//Loop designed to look at each part of an array and then classify it by letter grade.
for(int i = 0; (i < studs.length) && (studs != "-1"); i++){
grade = Integer.parseInt(studs);
studsCount++;
total += grade; //Adds the new grade to the running total.
//Determines letter Grade max and mins.
if((grade >= 90) && (grade>maxA)) maxA = grade;
if((grade >= 90) && (grade<minA)) minA = grade;
if((grade >= 80 && grade < 90) && (grade>maxB)) maxB = grade;
if((grade >= 80) && (grade<minB)) minB = grade;
if((grade >= 70 && grade < 80) && (grade>maxC)) maxC = grade;
if((grade >= 70) && (grade<minC)) minC = grade;
if((grade >= 60 && grade < 70) && (grade>maxD)) maxD = grade;
if((grade >= 60) && (grade<minD)) minD = grade;
if((grade < 60) && (grade>maxF)) maxF = grade;
if((grade < 60 && grade >= 0) && (grade<minF)) minF = grade;
//Calculates the number of each type of letter grade.
numberOfAs = (grade >= 90)?(numberOfAs + 1):numberOfAs;
numberOfBs = (grade >= 80 && grade < 90)?(numberOfBs + 1):numberOfBs;
numberOfCs = (grade >= 70 && grade < 80)?(numberOfCs + 1):numberOfCs;
numberOfDs = (grade >= 60 && grade < 70)?(numberOfDs + 1):numberOfDs;
numberOfFs = (grade < 60 && grade >= 0)?(numberOfFs + 1):numberOfFs;
//Calculates the total value of each letter grade category.
aScore = (grade >= 90)?(aScore += grade):aScore;
bScore = (grade >= 80 && grade < 90)?(bScore += grade):bScore;
cScore = (grade >= 70 && grade < 80)?(cScore += grade):cScore;
dScore = (grade >= 60 && grade < 70)?(dScore += grade):dScore;
fScore = (grade >= 0 && grade < 60)?(fScore += grade):fScore;
}//Start of Output
studsCount = studsCount - 1;
System.out.println();
System.out.println("Number of students " + studsCount);

System.out.println("------------------------------");

System.out.println("Number of A's " + numberOfAs);
System.out.println("Number of B's " + numberOfBs);
System.out.println("Number of C's " + numberOfCs);
System.out.println("Number of D's " + numberOfDs);
System.out.println("Number of F's " + numberOfFs);

System.out.println("------------------------------");
//Beware of integer math! Had to type to double; otherwise, would get 0.
System.out.println("Percentage A's " + (((double)numberOfAs / (double)studsCount) * 100) + "%");
System.out.println("Percentage B's " + (((double)numberOfBs / (double)studsCount) * 100) + "%");
System.out.println("Percentage C's " + (((double)numberOfCs / (double)studsCount) * 100) + "%");
System.out.println("Percentage D's " + (((double)numberOfDs / (double)studsCount) * 100) + "%");
System.out.println("Percentage F's " + (((double)numberOfFs / (double)studsCount) * 100) + "%");

System.out.println("------------------------------");
//Outputs maxes and mins based on the constraints of >-1 and <101.
if(maxA != -1)
System.out.print("Maximum A= " + maxA);
if(minA != 101)
System.out.println("\tMinimum A= " + minA);
if(maxB != -1)
System.out.print("Maximum B= " + maxB);
if(minB != 101)
System.out.println("\tMinimum B= " + minB);
if(maxC != -1)
System.out.print("Maximum C= " + maxC);
if(minC != 101)
System.out.println("\tMinimum C= " + minC);
if(maxD != -1)
System.out.print("Maximum D= " + maxD);
if(minD != 101)
System.out.println("\tMinimum D= " + minD);
if(maxF != -1)
System.out.print("Maximum F= " + maxF);
if (minF != 101)
System.out.println("\tMinimum F= " + minF);

System.out.println("------------------------------");
System.out.println("Average A score = " + (aScore / numberOfAs));
System.out.println("Average B score = " + (bScore / numberOfBs));
System.out.println("Average C score = " + (cScore / numberOfCs));
System.out.println("Average D score = " + (dScore / numberOfDs));
System.out.println("Average F score = " + (fScore / numberOfFs));

System.out.println("------------------------------");
System.out.println("Average score = " + (total / studsCount));
}
}
 
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