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Calculator Coding In JAVA

24 Mar

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A Calculator

Soon after writing a calculator program in C++ and Visual Basic; I started writing it in JAVA. Initially I felt it was quite tough to write it in a secured environment. But I was amazed to find that it was really very easy. Here I am giving an easy guide to my project work.

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Quick Revision(SET-I)

9 Mar

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1. The earlier computers, which were massive in size, were based on vacuum tubes.
2. Early computing machines, like the ENIAC, were actually meant to assist the armed forces.
3. The printers in pre-1950s were punch cards.
4. An improvement on the ENIAC, which pioneered ‘stored program’, was made possible with the help of the mathematician John von Neumann.
5. Before the 1950s, computers were mostly owned by universities and research labs.
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General Awareness of Computer Basics(SET-2)

9 Mar

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1. Which of the following is a part of the Central Processing Unit?

a. Printer

b. Key board

c. Mouse

d. Arithmetic & Logic unit

e. None

 

2. CAD stands for

a. Computer aided design

b. Computer algorithm for design

c. Computer application in design

d. All of the above

e. None

 

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General Awareness of Computer Basics(SET-I)

9 Mar

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1. All of the following are examples of storage devices EXCEPT:
A. hard disk drives.
B. printers.
C. floppy disk drives.
D. CD drives.
Answer: B

2. which of the following  is responsible for processing data in computer ?
A. motherboard
B. memory
C. RAM
D. central processing unit (CPU)
Answer: D

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Automated Solar Radiation Tracking System

8 Mar

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If we could configure a solar cell so that it faces the sun continually as it moves across the sky from east to west, we could get the most electrical energy possible. One way to do this, of course, is by hand. However, keeping a solar cell facing the sun throughout the day is not a very efficient use of a person’s time. Going outside to a solar cell every hour to turn it toward the sun might be possible, but this would still not be an efficient method. A photo sensor is employed to control the solar cell tracking system. For example, if the photo sensor is not aligned with sun rays, then it could turn on the motor until it is once again aligned. If the motor is attached to the frame holding the solar cell, then the solar cell could be moved to face the sun. As long as the photo sensor is in alignment with the sun, nothing happens. However, when the sun moves across the sky and is not in proper alignment with the photo sensor, then a motor moves the frame until the photo sensor is in the sun once more. Continue reading