Chapter 3 :- Input and Output Devices

Chapter 3 :- Input and Output Devices

Summary

The devices that allow such input and output are known as input/ output devices in short I/O devices) or peripherals.

Input/output devices are means of communication between the user and computer.

Input Devices :-

An input device is a device that provides input to the computer. The most common input devices are keyboard and mouse.

Following is the list of different input devices used with computers:

1. Keyboard

2. Point and draw devices

3. Scanning devices

4. Electronic card based devices

5. Speech recognition devices

6. Vision based devices

Output Devices :-

Computer calculated results must be provided to its users. The devices that provide output to the users are called output devices.

Following list presents different output devices:

1 Monitor

2 Printer

3 Projector

4 Plotter

5 Voice response

Choose the most appropriate option from those given below:

(1) Which of the following refers to data and instructions that are given to computer ?

(a) Input

(b) Output

(d) Processing

(2) Which of the following is the other name of Input/Output devices ?

(a) Properties

(b) Peripherals

(d) None of these

(3) A keyboard is considered as which of the following device?

(a) An input

(b) An output

(d) Processing

(4) A keyboard works on which of the following concepts ?

(a) Point and draw

(b) Text entry

(d) Virtual

(5) A mouse can also be used as which of the following device?

(a) An input

(b) An output

(d) Any of these

(6) Which of the following refers to the mouse ?

(a) Point and draw device

(b) Text based device

(d) Virtual device

(7) Which of the following is a standard coding system for product price and other information related to the product ?

(a) Universal product code

(b) Uniform print code

(d) Uniform product code

(8) Which of the following is the process of recognizing characters written with special magnetic ink?

(a) Multipurpose ink character recognition

(b) Magnetic ink character recognition

(d) Multifold ink character recognition

(9) Which of the following technologies do flat monitors use ?

(a) CRT

(b) LCD

(d) Both b and c

Chapter 3 :- Input and Output Devices (Video)

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11. Write a Java program to input basic salary of an employee and calculate its Gross salary according to following:

11. Write a Java program to input basic salary of an employee and calculate its Gross salary according to following: Basic Salary <= 10000 : HRA = 20%, DA = 80% Basic Salary <= 20000 : HRA = 25%, DA = 90% Basic Salary > 20000 : HRA = 30%, DA = 95% Static Solution :- class salary { public static void main(String args[]) { double basic=20000.50,gross,da,hra; if(basic <=10000) { da = basic * 0.8; hra = basic *0.2; } else if(basic <=20000) { da = basic * 0.9; hra = basic *0.25; } else { da = basic * 0.95; hra = basic * 0.3; } gross = basic + da + hra; System.out.println("The Gross Salary is :-"+gross); } } Output :- Dynamic Solution :- class salary { public static void main(String args[]) { double basic=20000.50,gross,da,hra; Scanner in = new Scanner(System.in); System.out.println("Enter the Basic Salary

1. Given the school result data, analyses the performance of the students on #different parameters, e.g subject wise or class wise.

1. Given the school result data, analyses the performance of the students on #different parameters, e.g subject wise or class wise. Solution :- # x-axis is shows the subject and y -axis # shows the markers in each subject # import pandas and matplotlib import pandas as pd import matplotlib.pyplot as plt # Simple Line Chart with setting of Label of X and Y axis, # title for chart line and color of line subject = ['Physic','Chemistry','Mathematics', 'Biology','Computer'] marks =[80,75,70,78,82] # To draw line in red colour plt.plot(subject,marks,'r',marker ='*') # To Write Title of the Line Chart plt.title('Marks Scored') # To Put Label At Y Axis plt.xlabel('SUBJECT') # To Put Label At X Axis plt.ylabel('MARKS') plt.show() Output :-

24.Create a Data Frame quarterly sales where each row contains the item category, item name, and expenditure. Group the rows by the category and print the total expenditure per category.

24.Create a Data Frame quarterly sales where each row contains the item category, item name, and expenditure. Group the rows by the category and print the total expenditure per category. import pandas as pd # initialize list of lists data = [['CAR','Maruti',1000000],['AC','Hitachi',55000],['AIRCOLLER','Bajaj',12000], ['WASHING MACHINE','LG',15000],['CAR','Ford',7000000],['AC','SAMSUNG',45000],['AIRCOLLER','Symphony',20000],['WASHING MACHINE','Wirlpool',25000]] Col=['itemcat','itemname','expenditure'] # Create the pandas DataFrame qrtsales = pd.DataFrame(data,columns=Col) # print dataframe. print (qrtsales) qs=qrtsales.groupby('itemcat') print('Result after Filtering Dataframe') print(qs['itemcat','expenditure'].sum()) Output :-

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