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Chapter04Exercise.zip

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Chapter 04 Exercise/.classpath

Chapter 04 Exercise/.project

ch04_ex2_AreaAndPerimeter org.eclipse.jdt.core.javabuilder org.eclipse.jdt.core.javanature

Chapter 04 Exercise/.settings/org.eclipse.jdt.core.prefs

eclipse.preferences.version=1 org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8 org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve org.eclipse.jdt.core.compiler.compliance=1.8 org.eclipse.jdt.core.compiler.debug.lineNumber=generate org.eclipse.jdt.core.compiler.debug.localVariable=generate org.eclipse.jdt.core.compiler.debug.sourceFile=generate org.eclipse.jdt.core.compiler.problem.assertIdentifier=error org.eclipse.jdt.core.compiler.problem.enumIdentifier=error org.eclipse.jdt.core.compiler.source=1.8

Chapter 04 Exercise/bin/murach/rectangle/Main.class

package murach.rectangle;
public synchronized class Main {
    public void Main();
    public static void main(String[]);
}

Chapter 04 Exercise/src/murach/rectangle/Main.java


package
 murach
.
rectangle
;








import
 java
.
text
.
NumberFormat
;




import
 java
.
util
.
Scanner
;








public
 
class
 
Main
 
{








    
public
 
static
 
void
 main
(
String
 args
[])
 
{




        
System
.
out
.
println
(
"Welcome to the Area and Perimeter Calculator"
);




        
System
.
out
.
println
();








        
Scanner
 sc 
=
 
new
 
Scanner
(
System
.
in
);




        
String
 choice 
=
 
"y"
;




        
while
 
(
choice
.
equalsIgnoreCase
(
"y"
))
 
{




            
// get input from user



            
System
.
out
.
print
(
"Enter length: "
);




            
double
 length 
=
 
Double
.
parseDouble
(
sc
.
nextLine
());








            
System
.
out
.
print
(
"Enter width:  "
);




            
double
 width 
=
 
Double
.
parseDouble
(
sc
.
nextLine
());








            
// calculate total



            
double
 area 
=
 width 
*
 length
;




            
double
 perimeter 
=
 
2
 
*
 width 
+
 
2
 
*
 length
;




            



            
// format and display output



            
NumberFormat
 number 
=
 
NumberFormat
.
getNumberInstance
();




            number
.
setMinimumFractionDigits
(
3
);




            
String
 message 
=
 



                
"Area:         "
 
+
 number
.
format
(
area
)
 
+
 
"\n"
 
+




                
"Perimeter:    "
 
+
 number
.
format
(
perimeter
)
 
+
 
"\n"
;




            
System
.
out
.
println
(
message
);








            
// see if the user wants to continue



            
System
.
out
.
print
(
"Continue? (y/n): "
);




            choice 
=
 sc
.
nextLine
();




            
System
.
out
.
println
();




        
}




        sc
.
close
();




        
System
.
out
.
println
(
"Bye!"
);




    
}




}