[ SOLVE] E-FAIL ERROR IN VIRTUAL BOX or VM ORACLE MACHINE

[ SOLVE] E-FAIL ERROR IN VIRTUAL BOX or VM ORACLE MACHINE

Runtime error opening 'C:\Users\COMPUTER_NAME\.VirtualBox\Machines\VM_NAME\VM_NAME.xml' for reading: -102 (File not found.).
D:\tinderbox\win-3.2\src\VBox\Main\MachineImpl.cpp[665] (Machine::registeredInit).
Result Code:
E_FAIL (0x80004005)
Component:
VirtualBox
Interface:
IVirtualBox {3f36e024-7fed-4f20-a02c-9158a82b44e6}

SOL:

I went into the folder "C:\Users\COMPUTER_NAME\.VirtualBox\Machines\VM_NAME\" and saw two xml files but for some reason they both had suffixes.
1. VM_NAME.xml-prev
2. VM_NAME.xml-tmp
So it simply just couldn't find "VM_NAME.xml" because it technically didn't exist.
I made a copy of the "VM_NAME.xml-prev" file and renamed the copy to "VM_NAME.xml"
Restarted VirtualBox and it worked just fine.

S0L2:
UPDATE VM AUTOMATICALLY  SOLVE THE ISSUE.

what is the difference between and "stdio.h"

what is the difference between

    and "stdio.h"

 

#include"ownheader.h"(own headerfile):

                  compalier will be  look  like as a local directory

#include:

                compalier searches as a standard libraries with in the system.

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INTRODUCTION TO JAVA AND JAVA EDITIONS AND NUMBER SYSTEMS IN JAVA

java

HISTORY OF JAVA AND DOWNLOAD(PDF)


what is java:
            java is a object oriented,platform independent programming language from sun micro system which is released into the marked on the name of development of the distributed applications.
 what is java slogan:
                      "Write Once Run Anywhere "(WORA)
java is a platform independent programming language.it means that program is written once and the program is executed irrespective of the operating system.
 why java is suitable for internet:
     security problems on internet are eliminated through java.java is a system independent,java is executable on any platform
JAVA HISTORY:
  IN 1990,sun microsystems inc., USA is developed software for remotes..in 1993,oak language is developed,by that time some company is registered oak name,for this reason they named as "java".
in 1995,sun world conference has given entire details of java.

javajavajava software all copy rights are purchased oracle

CLICK HERE DOWNLOAD PDF DOCUMENT 

java editions:

Sun micro systems provides ,with the advent of java,new versions had multiple configurations built for different types of platforms.those are

• JSE
• JEE
• JME.

JSE:java platform,standard edition:
JSE stands for java platform,standard edition,it is specification used to develop fundamental
java application they may be standard or network.

JEE:java platform,enterprise edition:

 JEE stands for java platform, enterprise edition,it is specification used to develop business
solutions for network (or)JEE is specification that provides an environment to run the web components and the enterprise components.

 JME:java platform,micro edition:
JEE stands for java platform, micro edition,it is specification used for developing wireless and
embedded system.embedded system is software,which directly installed into hardware.
java software:
             java software is cotegorized in to two types
                JAVA=JDK+JRE
  JDK
           it stands for java development kit
JRE:
          it stands for java runtime environment 
          JRE=JVM+JAVA LIBRARY

if java programs have to run we required the jvm and java library.jvm will starts execution of java
program from main method only.

• in java every statement must end with semi colon(;).
• java is case sensitive programming language.

In this real world we have 4 types of number systems they are:
1.binary number system           [format:0,1]
2.octal number system             [format:0,1----7]
3.decimal number system        [format:0,1-----9]
4.hexa decimal system             [format:0,1---9,a,b,c,d,e,f ] 
genarally we use the decimal number system in any programming language.

  In java we can represent the binary values by giving ob infront of the number
ex: int ob10;(correct)
     int x=o4235;(wrong)

representation of the binary number feature is introduced in java 1.7


we can represent the octal values in java programming language by giving o infront of the number
ex: int i=o24;(correct)
        int k=o248;(wrong)[because octal range 0-7]

we can represent the hexa decimal values in java programming language by giving ox infront of the number
ex: int i=ox123;(correct)
        int k=ox245a;(wrong)
         int k=123a;(wrong)

note:JVM takes the binary data ,octal data,decimal data,hexa decimal data convert in the form of decimal format and give the output as adecimal
example programme:
  class ndemo
{
public static void main(String args[])
{
  int i=24;
int j=o72;
int k=ox2a;
int l=ob10;
System.out.println(i);
System.out.println(j);
System.out.println(k);
System.out.println(l);
}
}
note:this programme run java 1.7 or above versions because binary values format does not suppport java 1.7 below versions.
output:
24
58
42
2

HISTORY OF C LANGUAGE

In c family there are different languages like following the chart:
 

the language B was developed by ken thmson in the year 1968 at AT&T( American Telephone and Telegraph Company)Bell labs.
By adding the new features do a B language a new language was developed that is 'C'
  the C language was developed by denis ritche and ken thmson this language was developed in a time period from 1970-1973,but the major invention development was happend in the year 1972.
the c language was developed at AT&T bell labs.

C LANGUAGE INTRODUCTION

The only way to learn a new programming language is by writing programs in it. The first program to write is the same for all languages:
Print the words:hello, world

In C, the program to print ``hello, world'' is
#include
main()
{
printf("hello, world\n");
}
Just how to run this program depends on the system you are using. 
complie the program click the alt+F9.and dispaly errors and warning.errors and warnings must be zero and next run the program click ctrl+F9 to display the output
As a specific example, on the UNIX operating system you must create the program in a file whose name ends in ``.c'', such as hello.c, then compile it with
the command
cc hello.c
If you haven't botched anything, such as omitting a character or misspelling something, the compilation will
proceed silently, and make an executable file called a.out. If you run a.out by typing the command
a.out
it will print
hello, world
ANOTHER EXAMPLE:

An example of simple program in C

#include

int main(void)

{

          printf(“HAI HOW ARE YOU\n”);

          printf(“FINE ”);

          printf(“you know the trick\n”);

          return(0);

} 

 

The previous program will produce the following output on your screen 

 HAI HOW ARE YOU

 FINE you know the trick

 

a C program line begins with # provides an instruction to the C preprocessor

It is executed before the actual compilation is done.

Two most common directives :

#include

#define 

In our example (#include) identifies the header file for standard input and output needed by the printf().

 

Identify the start of the program

Every C program has a main ( )

'main' is a C keyword.  We must not use it for any other variable

 

Identify a segment / body of a program

The start and end of a function

The start and end of the selection or repetition block.

Since the opening brace indicates the start of a segment with the closing brace indicating the end of a segment, there must be just as many opening braces as closing braces  (this is a common mistake of beginners) 

 

Each statement in C needs to be terminated with semicolon (;) 

Each statement in C needs to be terminated with semicolon (;)