The program that follows is a unit conversion program that asks the users: 1) fr
ID: 3698782 • Letter: T
Question
The program that follows is a unit conversion program that asks the users:
1) from which unit they want to convert (fl. oz, gal, oz, lb, in, ft, mi) and
2) to which unit they want to convert (ml, l, g, kg, mm, cm, m, km).
For example:
Convert from? gal
Convert to? ml
Value? 2.5
2.5 gal = 9462.5 ml
The code has many errors and omissions - both compiler and run-time problems. Your job is to fix them. Work in teams of three or four as assigned by your instructor.
java.util.Scanner;
public class UnitConversion
{
public static void main(String[] args)
{
final double ML_PER_FL_OZ = 29.5735296;
final double ML_PER_GAL = 3785.41178;
double G_PER_OZ = 28.3495231;
final double = 453.59237;
final double M_PER_IN = 0.0254
final M_PER_FT = 0.3048;
final double M_PER_MI = 1609.344;
Scanner = new Scanner(System.in);
System.out.print("Convert from? ");
String fromUnit = in.next();
system.out.print("Convert to? ");
String toUnit = in.next();
lastChar = toUnit.charAt(toUnit.length() - 1);
if (fromUnit.compareTo("fl. oz") == 0)
{
// fl. oz to ..
if (lastChar == 'l')
{
// fl oz to mililiters
System.out.print("Value? ");
double value = in.nextDouble();
double conversion = value * ML_PER_FL_OZ;
if (toUnit.charAt( ) == 'l')
{
// fl oz to liters
conversion /= 1000;
}
System.out.printf("%f %s = %f %s ", value, fromUnit, conversion, toUnit);
}
else
{
System.out. ("Incompatible Units.");
}
}
if ( .compareTo("gal") == 0)
{
// Gallons to ...
if (lastChar == 'l')
{
// Gallons to mililiters
System.out.print("Value? ");
double value = ;
double conversion = value * ML_PER_GAL;
if (toUnit.charAt(0) == 'l')
{
// Gallons to liters
conversion /= 1000;
}
System.out.printf("%f %s = %f %s ", value, fromUnit, conversion, toUnit);
}
else
{
System.out.println("Incompatible Units.");
}
}
if (fromUnit.compareTo("oz") == 0)
{
// oz to ...
if (lastChar == 'g')
{
// oz to grams
System.out.print("Value? ");
double value = in.nextDouble();
double conversion = value * ;
if (toUnit.charAt(0) = 'k')
{
// oz to kilograms
conversion /= 1000;
}
System.out.printf("%f %s = %f %s ", value, , conversion, toUnit);
}
else
{
System.out.println("Incompatible Units.");
}
}
if (fromUnit.compareTo("lb") == 0)
{
// lb to ...
if (lastChar == 'g')
{
// lb to grams
System.out.print("Value? ");
double value = in.nextDouble();
double conversion = value * G_PER_LB;
if (toUnit.charAt(0) == 'k')
{
// lb to kilograms
conversion /= 1000;
}
System.out.printf("%f %s = %f %s ", value, fromUnit, conversion, toUnit);
}
else
{
System.out.println("Incompatible Units.");
}
}
if (fromUnit.compareTo("in") == 0)
{
// in to ...
if (lastChar == 'm')
{
// in to m
System.out.print("Value? ");
double value = in.nextDouble();
double conversion = value * M_PER_IN;
if (toUnit.compareTo("km") == 0)
{
// in to kilometers
conversion /= 1000;
}
if (toUnit.compareTo("cm") == 0)
{
// in to centimeters
conversion *= 100;
}
if (toUnit.compareTo("mm") == 0)
{
// in to milimeters
conversion *= 1000;
}
System.out.printf("%f %s = %f %s ", value, fromUnit, conversion, toUnit);
}
else
{
System.out.println("Incompatible Units.");
}
}
if (fromUnit.compareTo("ft") == 0)
{
// ft to ...
if ( )
{
// ft to meters
System.out.print("Value? ");
double value = in.nextDouble();
double conversion = value * M_PER_FT;
if (toUnit.compareTo("km") == 0)
{
// ft to kilometers
conversion /= 1000;
}
if (toUnit.compareTo("cm") == 0)
{
// ft to centimeters
conversion *= 100;
}
if (toUnit. ("mm") == 0)
{
// ft to milimeters
conversion *= 1000;
}
System.out.printf("%f %s = %f %s ", value, fromUnit, conversion, toUnit);
}
else
{
System.out.println("Incompatible Units.");
}
}
if (fromUnit.compareTo("mi") == 0)
{
// m to ...
if (lastChar == 'm')
{
// mi to m
System.out.print("Value? ");
double value = in.nextDouble();
double conversion = value * M_PER_MI;
if (toUnit.compareTo("km") == 0)
{
// mi to kilometers
conversion /= 1000;
}
if (toUnit.compareTo(" ") == 0)
{
// mi to centimeters
conversion *= 100;
}
if (toUnit.compareTo("mm") == 0)
{
// mi to milimeters
conversion *= 1;
}
System.out.printf("%f %s = %f %s ", value, fromUnit, conversion, toUnit);
}
else
{
System.out.println(“ ");
}
}
}
Explanation / Answer
UnitConversion.java
import java.util.Scanner;
public class UnitConversion
{
public static void main(String[] args)
{
final double ML_PER_FL_OZ = 29.5735296;
final double ML_PER_GAL = 3785.41178;
double G_PER_OZ = 28.3495231;
final double G_PER_LB = 453.59237;
final double M_PER_IN = 0.0254;
final double M_PER_FT = 0.3048;
final double M_PER_MI = 1609.344;
Scanner in = new Scanner(System.in);
System.out.print("Convert from? ");
String fromUnit = in .next();
System.out.print("Convert to? ");
String toUnit = in .next();
char lastChar = toUnit.charAt(toUnit.length() - 1);
if (fromUnit.compareTo("fl. oz") == 0)
{
// fl. oz to ..
if (lastChar == 'l')
{
// fl oz to mililiters
System.out.print("Value? ");
double value = in .nextDouble();
double conversion = value * ML_PER_FL_OZ;
if (toUnit.charAt(0) == 'l')
{
// fl oz to liters
conversion /= 1000;
}
System.out.printf("%f %s = %f %s ", value, fromUnit,
conversion, toUnit);
} else
{
System.out.println("Incompatible Units.");
}
}
if (fromUnit.compareTo("gal") == 0)
{
// Gallons to ...
if (lastChar == 'l')
{
// Gallons to mililiters
System.out.print("Value? ");
double value = in .nextDouble();;
double conversion = value * ML_PER_GAL;
if (toUnit.charAt(0) == 'l')
{
// Gallons to liters
conversion /= 1000;
}
System.out.printf("%f %s = %f %s ", value, fromUnit,
conversion, toUnit);
} else
{
System.out.println("Incompatible Units.");
}
}
if (fromUnit.compareTo("oz") == 0)
{
// oz to ...
if (lastChar == 'g')
{
// oz to grams
System.out.print("Value? ");
double value = in .nextDouble();
double conversion = value * G_PER_OZ;
if (toUnit.charAt(0) == 'k')
{
// oz to kilograms
conversion /= 1000;
}
System.out.printf("%f %s = %f %s ", value, fromUnit,
conversion, toUnit);
} else
{
System.out.println("Incompatible Units.");
}
}
if (fromUnit.compareTo("lb") == 0)
{
// lb to ...
if (lastChar == 'g')
{
// lb to grams
System.out.print("Value? ");
double value = in .nextDouble();
double conversion = value * G_PER_LB;
if (toUnit.charAt(0) == 'k')
{
// lb to kilograms
conversion /= 1000;
}
System.out.printf("%f %s = %f %s ", value, fromUnit,
conversion, toUnit);
} else
{
System.out.println("Incompatible Units.");
}
}
if (fromUnit.compareTo("in") == 0)
{
// in to ...
if (lastChar == 'm')
{
// in to m
System.out.print("Value? ");
double value = in .nextDouble();
double conversion = value * M_PER_IN;
if (toUnit.compareTo("km") == 0)
{
// in to kilometers
conversion /= 1000;
}
if (toUnit.compareTo("cm") == 0)
{
// in to centimeters
conversion *= 100;
}
if (toUnit.compareTo("mm") == 0)
{
// in to milimeters
conversion *= 1000;
}
System.out.printf("%f %s = %f %s ", value, fromUnit,
conversion, toUnit);
} else
{
System.out.println("Incompatible Units.");
}
}
if (fromUnit.compareTo("ft") == 0)
{
// ft to ...
if (lastChar == 'm')
{
// ft to meters
System.out.print("Value? ");
double value = in .nextDouble();
double conversion = value * M_PER_FT;
if (toUnit.compareTo("km") == 0)
{
// ft to kilometers
conversion /= 1000;
}
if (toUnit.compareTo("cm") == 0)
{
// ft to centimeters
conversion *= 100;
}
if (toUnit.compareTo("mm") == 0)
{
// ft to milimeters
conversion *= 1000;
}
System.out.printf("%f %s = %f %s ", value, fromUnit,
conversion, toUnit);
} else
{
System.out.println("Incompatible Units.");
}
}
if (fromUnit.compareTo("mi") == 0)
{
// m to ...
if (lastChar == 'm')
{
// mi to m
System.out.print("Value? ");
double value = in .nextDouble();
double conversion = value * M_PER_MI;
if (toUnit.compareTo("km") == 0)
{
// mi to kilometers
conversion /= 1000;
}
if (toUnit.compareTo("cm") == 0)
{
// mi to centimeters
conversion *= 100;
}
if (toUnit.compareTo("mm") == 0)
{
// mi to milimeters
conversion *= 1;
}
System.out.printf("%f %s = %f %s ", value, fromUnit,
conversion, toUnit);
} else
{
System.out.println("Incompatible Units.");
}
}
}
}
___________________
Output:
Convert from? gal
Convert to? l
Value? 10
10.000000 gal = 37.854118 l
_______________Thank You
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