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Computers
This category includes questions and answers about computers and everything related to computers.
48,002 Questions
What are the various applications of computer?
Computers have their application or utility everywhere. We find their applications in almost every sphere of life-particularly in fields where computations are required to be done at a very fast speed and where data is so complicated that the human brain finds it difficult to cope up with.
As you must be aware, computer now-a-days are being used almost in every department to do the work at a greater speed and accuracy. They can keep the record of all the employees and prepare their pay bill in a matter of minutes every month. They can keep automatic checks on the stock of a particular item. Some of the prominent areas of computer applications are:
In Tourism: Hotels use computers to speed up billing and checkout the availability of rooms. So is the case with railways and airline reservations for booking tickets. Architects can display their scale models on a computer and study them from various angles and perspectives. Structural problems can now be solved quickly and
accurately.
In Banks: Banks also have started using computers extensively. Terminals are provided in the branch and the main computer is located centrally. This enables the branches to use the central computer system for information on things such as current balance,deposits, overdrafts, interest charges, etc. MICR encoded cheques can be read and sorted out with a speed of 3000 cheques per minute by computers as compared to hours taken by manual sorting. Electronic funds transfer (EFT) allows a person to transfer funds through computer signals over wires and telephone lines making
the work possible in a very short time.
In Industry: Computers are finding their greatest use in factories and industries of all kinds. They have taken over the work ranging from monotonous and risky jobs like welding to highly complex jobs such as process control. Drills, saws and entire assembly lines can be computerized. Moreover, quality control tests and the manufacturing of products, which require a lot of refinement, are done with the help of computers. Not only this, Thermal Power Plants, Oil refineries and chemical industries fully depend on
computerized control systems because in such industries the lag between two major events may be just a fraction of a second.
In Transportation: Today computers have made it possible for planes to land in foggy and stormy atmosphere also. The aircraft has a variety of sensors, which measure the plane's altitude, position, speed, height and direction. Computer use all this information to keep the plane flying in the right direction. In fact, the Auto-pilot feature has made the work of pilot much easy.
In Education: Computers have proved to be excellent teachers. They can possess the knowledge given to them by the experts and teach you with all the patience in the world. You may like to repeat a lesson hundred times, go ahead, you may get tired but the computer will keep on teaching you. Computer based instructions (CBI) and Computer Aided Learning (CAL) are common tools used for teaching. Computer based encyclopedia such as Britannica provide you enormous amount of information on anything.
In Entertainment: Computers are also great entertainers. Many computer games are available which are like the traditional games like Chess, football, cricket, etc. Dungeons and dragons provide the opportunity to test your memory and ability to think. Other games like Braino and Volcano test your knowledge.
How can I switch my computer's voltage from 220V to 120V?
In the United States 240 volts is produced by two 120 volt hot wires 180 degrees out of phase. Added together the voltage difference is 240 volts. To get only 120 volts one of the hot wires needs to be replaced with a neutral wire.
That would make the voltage difference to the neutral 120 volts. (There may or may not be an existing neutral wire running to the outlet. Whether there is one depends on the purpose for which the 240 volt outlet was originally installed.)
It is often not worthwhile to change the existing 240 volt outlet - it is often best just to leave it there to power 240 volt appliances.
A licensed electrician would know how to check this for you and would advise the best action for you to take. He would use the correct size of wire to supply the current required by the 110 - 120 volt appliances you want to use and connect it to the correct sizes of circuit breakers on the main panel and also a GFCI safety device to protect users from electrocution if the room is likely to be damp or have water spray or wet floors, walls or ceiling, such as a laundry room or a kitchen. All this is necessary to comply with the latest Wiring Codes in your locality. (Town/State.)
Then you would be able to use a 110 - 120 volt appliances safely in the room in question.
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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
Difference between computer application and computer science?
An application is a program in general, for instance, Internet Explorer, Microsoft Word and Notepad.
A process is single instance of an application whilst it is running.
Binary Coded Decimal (BCD) is a set of coding systems for storing decimal digits in binary code. There are several such codes, I will give examples of 3: straight BCD, XS3 BCD, and 2 of 5 BCD.
Straight BCD uses the actual binary value of the decimal digit value:
0 = 0000
1 = 0001
2 = 0010
3 = 0011
4 = 0100
5 = 0101
6 = 0110
7 = 0111
8 = 1000
9 = 1001
XS3 BCD adds 3 to the binary value of the decimal digit value to make the code:
0 = 0011
1 = 0100
2 = 0101
3 = 0110
4 = 0111
5 = 1000
6 = 1001
7 = 1010
8 = 1011
9 = 1100
2 of 5 BCD uses a 5 bit code where only 2 bits can be on in a decimal digit's code:
0 = 00011
1 = 11000
2 = 10100
3 = 10010
4 = 10001
5 = 01100
6 = 01010
7 = 01001
8 = 00110
9 = 00101
Computer ethics is a body of principles/behaviors that are considered as acceptable for all parties in the computing world to follow. Computer ethics are rules of law but some rules are derived from them.
How do you input programs into your computer?
If by program you mean OS, your available options depends on your OS. If you have a PC (aka Windows), you can install Ubuntu, Kubuntu, and other Linux OSs to run alongside Windows. If you have a Mac, you can install Windows and Linux. Virtual Machine software allows you to do this without rebooting your computer to change the OS. There are many different applications that can let you do this. Some you have to pay for, like Parallels Desktop or VMWare Fusion. There are also open source (free) ones, like Oracle VirtualBox.
A couple scenarios:
Install Windows on a Mac: You can use Boot Camp, a preinstalled application that walks you through the installation process. You can also use any of the VM apps listed above.
Install Ubuntu on a PC: You can use the Wubi installer provided with all versions of Ubuntu when you download them in the related link, or you can use a VM app.
Install Ubuntu on a Mac: You cannot use the Wubi on a Mac, you will need to create a bootable USB drive (steps in the related link). You can also run Ubuntu as a VM.
What properties are desirable in semiconductors?
A piece of intrinsic (pure) silicon at room temperature has, at any instant, a number of conduction-band (free) electrons bthat are unattached to any atom and are essentially drifting randomly throughout the material. Also, and equal number of holes are created in the valence band when these electrons jump into the conductance band.
Can computer matching programs involving federal benefits programs be used to determine what?
That you are ineligible for health insurance.
Can you get a Math chart liquid measurement?
In the metric system, the same units are used for volume, whether you measure liquids, solids, or gases. Commonly used units include the cubic meter, the cubic decimeter (or liter), and the cubic centimeter (or milliliter).
How many Light sources are available for optical fiber?
There are 142 light sources. The types of light forms are Natural which are Celestial and atmospheric light, terrestrial, and nuclear or high energy related. Other categories are direct chemical, electric powered, electron stimulated, incandescent lamps, electroluminescent lamps, gas discharged lamps, high intensity discharge, laser, combustion, nuclear, and others.
Why is binary data representation and signaling the preferred method of computer?
The short answer is that it's cheaper. Base 2 (binary) is the most primitive form of numeric notation there is and it is extremely simple to implement using a bewildering array of mediums. For example, a switch is either on or off; a capacitor has a sufficient charge or it does not; polarised particles are either positively or negatively charged; a punch card has a hole at a given position or it does not; a DVD either has a flat or a land; a barcode element either reflects light or it absorbs light; and so on.
While it is certainly possible to implement a digital computer using a numeric base other than base 2, the complexity (and the cost!) of interpreting those bases increases exponentially. Polarised digital states (yes/no, true/false, on/off, black/white, positive/negative) are extremely simple to detect and represent because there are only 2 possible states and 1 threshold per digit. More importantly, switching from any one state to any other state is a constant time operation.
Consider the capacitor: it either has sufficient charge or it does not, but it must be refreshed at regular intervals in order to maintain state (if we don't refresh often enough, a full charge will drain away in just a few milliseconds resulting in a misread digit). But if the specific level of charge actually indicated a digit in the range 0 to 9 we'd not only need much larger capacitors to cover the range with comfortable margins of error between refreshes, we'd also need extremely precise transistors to both read and refresh the charge. The more digits we represent per capacitor, the more complex it becomes.
What part of the computer processes information?
Computers takes input through input devices like keyboard and mouse. Every actions on or by the input devices are converted into electromagnetic signals. These electrical signals are sent to Signal Processing Units, which converts the analog signal into digital one and transfers it directly to processor or to processor via memory for further processing. Like sensors inside the mouse record every movement of mouse into electrical signals and transfer it to ADC (analog to digital converter.)
What is polymorphism explain and example?
Polymorphism is the use of different Types to declare a variable, it is closely related to the inheritance hierarchy. It is used to often hide information from the client concerning how a piece of code works, they should only concern themselves with how to use it.
For instance:
//Declaring lists
//Can declare like this
ArrayList list = new ArrayList();
//or to hide information on how the list is implemented
List list2 = new ArrayList();
//Therefore the user only needs to know the List interface's methods to interact, don't //have to be concerned about the ArrayList implementation.
Some syntax rules for polymorphism:
//You have to Declare using the same or higher level of inheritance than you are //instantiating the Object as
//i.e. Child class is a child of the Parent class (i.e. Child extends Parent)
//therefore, you can
//Declare as a Parent
Parent c1 = new Child(); // Example 1
//Declare as a Child
Child c2= new Child(); //Example 2
//But you cannot declare as a Child and instantiate as a Parent
Child thisIsWrong = new Parent(); //Example 3
A really good check to see if you have the Instantiation right is to say the Instantiating class name(the one after the "=")IS A Declaring class name(the one before the "=") , if the statement makes sense then it is legal. For example, example 1: Child is a Parent? true, legal. example 2: Child is aChild? legal. example 3: Parent is a Child? false, illegal.
Using Polymorphism
Polymorphism hides the child's methods from the user if the variable is declared with the parent, which is useful if you don't want the user messing with the child methods.
As with the top example, first example with the declaration as a Parent c1 cannot use the child methods unless you cast c1 into a child (i.e. ( (Child) c1).cry() ). But in example 2 the Child method could be used since c2 is essentially a Child.
Real time Example on inheritance?
Its like father and child relationship.. the child got some properties from his father like physically.. but personally he possess his own properties.
Or
we may also say a vehicle to machine.vehicle is a machine ... but it inherits some properties from the machine.
What is the fastest computor in the world?
As of now, the fastest computer in the world is Fugaku, developed by RIKEN and Fujitsu in Japan. Fugaku is a supercomputer that is used for various scientific simulations and research projects, and it has held the top position in the TOP500 list of supercomputers since June 2020.
In C plus plus What symbol is used to denote the declaration of a dynamic array?
We don't generally use dynamic arrays in C++, we use vectors instead. The problem with dynamic arrays is that we must keep track of how many elements are allocated in the array, and must manually manage the memory allocated to the array, just as we do in C. Vectors do this automatically for us and allow us to pass dynamic arrays into functions by reference. This ultimately makes it much easier to use a dynamic array without having to worry about how it is physically implemented.
Is biotechnology a medical subject or an engineering subject?
Biotechnology could combine both subject matter from medicine and from engineering. Biotechnology is based in biology. But it is often used to refere to genetic engineering. Biochemistry, organic chemistry or chemical engineering can play a part in biotechnology. A link is provided to the Wikipedia article on biotechnology. Surf on over and just read the first paragraph and see what kind of picture you come away with.
What is the role of a technical support engineer?
The role of a technical support engineer is to plan analyze the program of the each profile plan, as per standard engineering requirements, specification of the project.
Relationship between phase and frequency modulation?
Wavelength lambda and frequency f are connected by the speed c of the medium. c can be air = 343 m/s at 20 degrees celsius or water at 0 dgrees = 1450 m/s. c can be light waves or electromagnetic waves = 299 792 458 m/s. The formulas are: c = lambda x f f = c / lambda lambda = c / f
Where are the results of the 7th national Cyber Olympiad?
find the result on the official website www.sofworld.org.
Name three examples of secondary storage devices?
The most popular secondary storage devices are hard disks, CDs, DVDs, USB Flash drive and floppy disks.
What is difference between core and processor?
A processor, or more commonly a CPU, is an individualized processing device. It may contain multiple cores.
A core is a bank of registers and dedicated cache structure that performs all of a processor's tasks, but is not an entire processor. For example, more multi-core processors have a separate array of logic functions that are not integrated with the core, such as the Memory Controller in AMD Phenom and Phenom II processors. There is one (or two, in the Phenom II) memory controllers total for the processor, reguardless of the number of cores.
Think of a 'core' as a cylinder in an engine. A V8 enginer has 4 'cores', but the engine is the 'processor'. You can have a V12 or a W32 or a V4 or any of another combination, but there's only one processor. However the number of cores can greatly influence the overall power and capability of the processor.
What are digital computers used for?
Digital computers, well, your using one to ask your question!
Digital computers, most people just call them Computers, or PC's, are used for a variety of things.
For one, the Internet, which you are using right now on a Digital computer. All computers are digital.
Perhaps you should research PC's
http://en.wikipedia.org/wiki/Digital_PC
Other uses:
Games
Writting documents
Reading information
Information databases
Website hosting (servers)
Research
Data collection
And so much more!
A computer program is a list of instructions written in a special language that the computer understands. It tells the computer which operations to perform and in what sequence to perform them. Programs can be written in various "languages", such as C/C++, Java, Assembly, etc., which will then be converted to machine language by one of two pieces of software, a compiler or an interpreter.
A computer program is a sequence of one or more instructions and their operands written in machine code that a computer can understand. Programs are usually written in a high-level language that is easier for humans to understand, which the computer itself can then compile (using another program) into machine code that it understands. Once a program is compiled it can then be executed. Machine code can also be hand-crafted using a low-level language known as Assembler. Every machine has its own version of Assembler, specific to its particular architecture. By contrast, Disassembly is the process of reverse-engineering machine code in order to reproduce the original Assembler instructions. However, the resulting code will lack the comments and symbolic code that were used by the original author of the program (all of which were stripped out during assembly).
Some computer programs are not compiled into machine code. These programs are designed to be run within another program (which is itself machine coded). For instance, Java programs are compiled into byte code suitable for the Java virtual machine (JVM). The JVM is a machine code program that understands the byte code instructions and translates them into suitable machine code. This is known as interpretation, thus Java is an interpretive high-level language.
As a result of this interpretation, Java programs are very much slower than their equivalent machine coded programs. By contrast, C++ is compiled to native machine code and is therefore many times faster than an equivalent Java program. However, C++ programs must be compiled separately for each supported platform, whereas Java will run on any platform that runs a JVM implementation, without any need to recompile.
Write a c program to arrange the digits of a number in ascending order?
#include
#include
void main()
{
int n ,i,j,temp,a[12]; //in a[] specify some number .
printf("Enter the no of inputs:");
scanf("%d", &n);
printf("Enter %d integer numbers :", n);
for(i=0;i { scanf("%d",&a[i]); } for (i=0;i for(j=i+1;j { if(a[i]>a[j]) { temp=a[j]; a[j]=a[i]; a[i]=temp; } } printf("THE %d NUMBERS SORTED IN ASCENDING ORDER ARE :\n", n); for(i=0;i { printf("%d ",a[i]); } getch(); } Here is another version of the program. While the previous one is obviously simpler, this one is a good program to master the basics of pointer and array problems which might plague them at the beginning. #include #include int a[100],i,j,k,n; void sort(int *a,int n); void swap(int *x,int *y); main() { printf("How many numbers? "); scanf("%d",&n); printf("Enter the %d numbers separated from each other by a blank space: \n\n",n); for (i=0;i scanf("%d",&a[i]); sort(a,n); printf("\nThe numbers in descending order is: \n"); for (k=0;k printf("\n%d",a[k]); printf("\n\n"); } void sort(int *a,int n) { int p=n-1; while (p>=0) { for(i=0;i<=(p-1);++i) { if (a[i]<=a[i+1]) swap(&a[i],&a[i+1]); else continue; } --p; } } void swap(int *x,int *y) { int t; t=*x; *x=*y; *y=t; }
