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cricket20 [7]
3 years ago
11

Explain the levels of data model​

Computers and Technology
1 answer:
gregori [183]3 years ago
4 0

Answer:

Data modeling occurs at three levels—physical, logical, and conceptual.

  • A physical model is a schema or framework for how data is physically stored in a database.

  • A conceptual model identifies the high-level, user view of data.

  • A logical data model sits between the physical and conceptual levels and allows for the logical representation of data to be separate from its physical storage.

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When do images or graphics in Microsoft Word hurt the document rather than help
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Answer:

When images or graphics excessively occupy most of the space on the page.

<u>Explanation:</u>

For example, if you observed the attached image you'll see a bad example in which the image excessively occupies most of the space on the page making the written text difficult to read.

Next, a good example of proper editing is found in the next image, which shows the written text properly aligned with the text.

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The major objective of this lab is to practice class and object-oriented programming (OOP), and separate files: 1. We will reuse
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Answer:

Implementation of resistor.cpp

#include "resistor.h"

Ohms::Ohm()

{

// default constructor

voltage=0;

}

Ohms::Ohm( double x) // parameterised constructor

{

voltage = x; // voltage x set to the supply voltage in the private data field called voltage

}

Ohms:: setVoltage(double a)

{

voltage = a;// to set supply voltage in private data field called voltage

}

Ohms::setOneResistance( String s, double p)

{

cin>>p; //enter the resistance value

if(p<=0) // if resistance is less than or equals to 0

return false

else // if re

cin.getline(s);

}

Ohms::getVoltage()

{

return voltage; //return voltage of ckt

}

Ohms::getCurrent()

{

return current; //return current of ckt

}

Ohms:: getNode()

{

return resistors; //return resistors of ckt

}

Ohms::sumResist()

{

double tot_resist = accumulate(resistors.begin(),resistors.end(),0); //std::accumulate function for calculating sum //of vectors and following are the starting and ending points

return tot_resist;

}

Ohms::calcCurrent()

{

if(current <=0) // if current is less than or equal to 0

return false;

else   // if current is greater than 0

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}

Ohms:: calcVoltageAcross()

{

if(voltage<=0) // if voltage is less than or equal to 0

return false;

else //if voltage greater than 0

return true;

}

Explanation:

in the case of main.cpp its simple just make a class object and remember to include resistors.cpp with it for which the second last picture describes the process precisely. (Hint: Use theunit test case functions in the main.cpp).

As you can see node is a structure consisting of member variables, followed by a class Ohms representing a DC circuit.

By looking at these pictures, it is needed to implement the main.cpp and resistor.cpp files. The user defined header file resistor.h already consists of all contents of Class Ohm, struct node. You don't need to modify it in anyway in such case.

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