Don Williams

Thanks for the help.

The following errors are what I'm getting when I compile this program. Can you help, no matter what I try, it still comes up error.

Thanks


C:\Sun\AppServer\jdk\bin\Temperature.java:57: illegal start of expression
public double read()//<---------------------HERE^
C:\Sun\AppServer\jdk\bin\Temperature.java:162: illegal start of expression
private char myScale;//<----------------------------HERE
^
2 errors

Tool completed with exit code 1


import java.io.*; import java.util.*; public class Temperature { public final static double ABSOLUTE_ZERO_FAHRENHEIT = -459.67, ABSOLUTE_ZERO_CELSIUS = -273.15; // Postcondition: myDegrees == 0.0 && myScale == 'C'. { myDegrees = 0; myScale = 'C'; } public Temperature(double degrees, char scale) { if (isValidTemperature(degrees, scale)) { myDegrees = degrees; myScale = Character.toUpperCase(scale); } else fatal("Temperature(degrees, scale)", "invalid args: " + degrees + scale); } // Return: myDegrees public double getDegrees() { return myDegrees; } // Return: myScale public char getScale() { return myScale; } // input/output methods public boolean read() { Keyboard k = new Keyboard(); { double inDegrees = theKeyboard.readDouble(); char inScale = theKeyboard.readChar(); if (isValidTemperature(inDegrees, inScale)) { myDegrees = inDegrees; myScale = Character.toUpperCase(inScale); return true; } else return false; } [B]public double read()//<---------------------HERE[/B] { return myDegrees + " " + myScale; // Converters Temperature result = null; if (myScale == 'F') result = new Temperature(myDegrees, 'F'); else if (myScale == 'C') result = new Temperature(myDegrees * 1.8 + 32.0, 'F'); else if (myScale == 'K') result = new Temperature((myDegrees - 273.15) * 1.8 + 32.0, 'F'); return result; } // Celsius converter // Return: the Celsius equivalent public Temperature inCelsius() { Temperature result = null; if (myScale == 'C') result = new Temperature(myDegrees, 'C'); else if (myScale == 'F') result = new Temperature( (myDegrees - 32.0) / 1.8, 'F'); return result; } // Return Temperature that amount degrees is equivalent. public Temperature raise(double amount) { double newDegrees = myDegrees + amount; if (!isValidTemperature(newDegrees, myScale)) Controller.fatal("raise(double)", newDegrees + " " + myScale + " is not a valid temperature"); return new Temperature(newDegrees, myScale); } // Receive otherTemp, the Temperature to which is being compared public double compareTo(Temperature otherTemp) { Temperature localTemp = null; // the equivalent of otherTemp, // but in my scale if (myScale == 'C') localTemp = otherTemp.inCelsius(); else if (myScale == 'F') localTemp = otherTemp.inFahrenheit(); else if (myScale == 'K') localTemp = otherTemp.inKelvin(); if (myDegrees < localTemp.getDegrees()) return -1.0; else if (myDegrees > localTemp.getDegrees()) return 1.0; else return 0.0; } // Return true if current Temperature object == otherTemp, or false public boolean equals(Temperature otherTemp) { return compareTo(otherTemp) == 0.0; } // Return true if current Temperature object < otherTemp, or false public boolean lessThan(Temperature otherTemp) { return compareTo(otherTemp) < 0.0; } // copy instance method, to support assignments, initializations. public Temperature copy() { return new Temperature(myDegrees, myScale); } // Receive: degrees, a double; scale, a char public static boolean isValidTemperature(double degrees, char scale) { if (scale == 'C' || scale == 'c') return degrees >= ABSOLUTE_ZERO_CELSIUS; else if (scale == 'F' || scale == 'f') return degrees >= ABSOLUTE_ZERO_FAHRENHEIT; else if (scale == 'K' || scale == 'k') return degrees >= ABSOLUTE_ZERO_KELVIN; else return false; } // Fatal error utility. private static void fatal(String methodName, String diagnostic) { System.err.println("\n*** " + methodName + ": " + diagnostic); System.err.flush(); System.exit(1); } //--- Attribute variables private double myDegrees; [B] private char myScale;//<----------------------------HERE[/B] } }

C:\Sun\AppServer\jdk\bin\Student.java:31: array dimension missing
Student pupil[i] = new Student[];
^
1 error

I have tried corrected but it seems that I am not setting up my array correctly.

import java.io.*; // create a student class from which to create a student object which will have 5 grades class Student { // array that stores 5 grades public char[] grade = new char[5]; } // Student public class GradePoint { public static void main (String [] args) throws IOException { // Fields int i, c; char letter; // create an array of 10 student objects from class Student... for (i=0; i<10; i++) { Student pupil[i] = new Student[]; // ...get 5 grades for each student System.out.println ("\nEnter grades for Student #" + (i+1)); for (c=0; c<5; c++) { System.out.print ("\nEnter grade #" + (c+1) + ": "); letter = System.in.read (); if ((letter == 'A') || (letter == 'B') || (letter == 'C') || (letter == 'D') || (letter == 'F')) pupil[i].grade[c] = letter; else { System.out.print ("Invalid grade letter."); c--; } // else } // for } // for } // main } // GradePoint

Thanks everyone for your help. I had it working at one time, and screwed it up. I've been struggling with this thing for about a week, I guess I was thinking to hard.

The Error is;
Exception in thread "main" java.lang.NoSuchMethodError:main
Press any key to continue...

I am having a problem in a program that' s suppose to plot a graph of grades. This programs compiles ok, except for a generic error. I have had the program working before, but seem to have did something that I can' t seem to remember. I have been searching for a week, and have been working on this program for two weeks. Can you help?

Here is the code:




import java.util.*; import java.io.*; public class GradeGraph { double maxMark = 100; final int PERCENT_INTERVAL = 10; int maxStars = 100; String starChar = "*"; int starsInInterval = 10; static Map gradeMapInPercent = new HashMap(); boolean areMarksInPercent; Set ratingSet; static { gradeMapInPercent.put("A", new Double(95)); gradeMapInPercent.put("B", new Double(85)); gradeMapInPercent.put("C", new Double(70)); gradeMapInPercent.put("D", new Double(60)); } public GradeGraph(int starsInInterval, String starChar) { if (starChar != null)this.starChar = starChar; this.starsInInterval = starsInInterval; maxStars = starsInInterval*PERCENT_INTERVAL; ratingSet = new TreeSet(gradeMapInPercent.keySet()); } private double getmarkInPercent(double mark) { return mark/maxMark; } private String getRating(double markInPercent) { String rating = "A"; Iterator it = ratingSet.iterator(); while (it.hasNext()) { rating = (String)it.next(); double ratingCeilingmark = ( (Double)gradeMapInPercent.get(rating) ) .doubleValue(); if (markInPercent ⁢ ratingCeilingmark) break; } return rating; } private int getNumberOfStars (double markInPercent) { return (int)Math.round(markInPercent * maxStars / 100); } private void printReferenceLine() { for (int i=1; i⁢10; i++) { for (int j=0; j⁢starsInInterval-2; j++) System.out.print(" "); System.out.print(i*PERCENT_INTERVAL); } System.out.println(""); printStars(maxStars); } private void printmark(double mark, boolean ismarkInPercent) { double markInPercent = ismarkInPercent ? mark : getmarkInPercent(mark); System.out.println(""); printStars(getNumberOfStars(markInPercent)); System.out.print(getRating(markInPercent)); System.out.print("("+ mark +")"); } private void printStars(int numberOfStarsToPrint) { for (int i=0; i⁢numberOfStarsToPrint; i++) { System.out.print(starChar); } } public void graphGrades(double[] marks, double maxmark, boolean aremarksInPercent) { printReferenceLine(); if (marks == null) return; { for (int i=0; i⁢marks.length; i++) { System.out.print(areMarksInPercent); } } } public void main(String[] args) throws IOException { double[] marksInPercent = {87.4, 98.7, 72.3, 60}; new GradeGraph(7, "*").graphGrades(marksInPercent, 100, true); } }