"ConvertTemperature.java" 118L, 3871C written
aylward@sunfire [22:13:09] ~ $ javac ConvertTemperature.java
ConvertTemperature.java:114: error: variable sourceString might not have been initialized
        System.out.println(temperature + " degrees " + sourceString + " = " + df.format(newTemp) + " degrees " + destString);
                                                       ^
ConvertTemperature.java:114: error: variable newTemp might not have been initialized
        System.out.println(temperature + " degrees " + sourceString + " = " + df.format(newTemp) + " degrees " + destString);
                                                                                        ^
2 errors
aylward@sunfire [22:13:14] ~ $ vim ConvertTemperature.java
  1 // CS1020 (AY2014/5 Semester 2)
  2 // Take-home Lab1 Ex1
  3 // Name: aylward
  4 // Matric. No.: A0124174L
  5 // Lab group: 4
  6 // Write the program description below.
  7 // It is mandatory to write program description at the top of every
  8 // program.
  9 // Marks will be awarded for this in sit-in labs.
 10
 11 //this program will read a temperature and convert the value from one
 12 //scale to another in two decimal places.
 13
 14 import java.util.Scanner;
 15 import java.text.DecimalFormat;
 16
 17 public class ConvertTemperature {
 18
 19     public static void main(String[] args){
 20
 21         Scanner sc = new Scanner(System.in);
 22
 23         System.out.print("Enter temperature: ");
 24         double temperature = sc.nextDouble();
 25         printMenuSource();
 26         int fromScale = sc.nextInt();
 27         printMenuDest(fromScale);
 28         int toScale = sc.nextInt();
 29
 30         convert(temperature, fromScale, toScale);
 31     }
 32
 33     // Print menu to select source scale
 34     private static void printMenuSource() {
 35         System.out.println();
 36         System.out.println("Choose source scale:");
 37         System.out.println("  1. Celsius");
 38         System.out.println("  2. Fahrenheit");
 39         System.out.println("  3. Kelvin");
 40         System.out.print("Enter your choice: ");
 41     }
 42
 43     //Print menu to select destination scale
 44     private static void printMenuDest(int scale) {
 45         System.out.println();
 46         if (scale == 1) {
 47             System.out.println();
 48             System.out.println("Choose destination scale:");
 49             System.out.println("  1. Fahrenheit");
 50             System.out.println("  2. Kelvin");
 51             System.out.print("Enter your choice: ");
 52         } else if (scale == 2) {
 53             System.out.println();
 54             System.out.println("Choose destination scale:");
 55             System.out.println("  1. Celsius");
 56             System.out.println("  2. Kelvin");
 57             System.out.print("Enter your choice: ");
 58         } else if (scale == 3) {
 59             System.out.println();
 60             System.out.println("Choose destination scale:");
 61             System.out.println("  1. Celsius");
 62             System.out.println("  2. Fahrenheit");
 63             System.out.print("Enter your choice: ");
 64         } else {}
 65     }
 66
 67     // Convert temperature from fromScale to toScale
 68     private static void convert(double temperature, int fromScale,
 69             int toScale) {
 70
 71         double newTemp;
 72         String sourceString, destString;
 73
 74
 75         if (fromScale == 1 && toScale == 1) {
 76             newTemp = 1.8 * temperature + 32.0;
 77         } else if (fromScale == 1 && toScale == 2) {
 78             newTemp = temperature + 273.15;
 79         } else if (fromScale == 2 && toScale == 1) {
 80             newTemp = (double)5/9 * (temperature - 32.0);
 81         } else if (fromScale == 2 && toScale == 2) {
 82             newTemp = (double)5/9 * (temperature - 459.67);
 83         } else if (fromScale == 3 && toScale == 1) {
 84             newTemp = temperature - 273.15;
 85         } else if (fromScale == 3 && toScale == 2) {
 86             newTemp = 1.8 * (temperature - 273.15) + 32.0;
 87         } else {}
 88
 89         //determine unit of measurement to print at the end.
 90
 91         if (fromScale == 1) {
 92             sourceString = "Celsius";
 93             if (toScale == 1) {
 94                 destString = "Fahrenheit";
 95             } else {
 96                 destString = "Kelvin";
 97             }
 98         }
 99
100         else if (fromScale == 2) {
101             sourceString = "Fahrenheit";
102             if (toScale == 1) {
103                 destString = "Celsius";
104             } else {
105                 destString = "Fahrenheit";
106             }
107         } else {
108             destString = "Fahrenheit";
109         }
110
111         DecimalFormat df = new DecimalFormat("0.00");
112
113         System.out.println();
114         System.out.println(temperature + " degrees " + sourceString + " = " + df.format(newTemp) + " degrees " + destString);
115     }
116 }