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Sidana [21]
3 years ago
14

The primary key is a field that uniquely and completely identifies a record.

Computers and Technology
2 answers:
Leokris [45]3 years ago
6 0
True

----------------------------------
Mazyrski [523]3 years ago
4 0
Yes it does.. so what's the question

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Write a program that will open the file random.txt and calculate and display the following: A. The number of numbers in the file
Rama09 [41]

Answer:

Here is the C++ program:

#include <iostream>  //to use input output functions

#include <fstream>  //to manipulate files

using namespace std;  //to identify objects like cin cout

int main(){  //start of main function

  ifstream file;   //creates an object of ifstream

   file.open("random.txt"); //open method to open random.txt file using object file of ifstream

       

    int numCount = 0;  //to store the number of all numbers in the file          

    double sum = 0;   //to store the sum of all numbers in the file

    double average = 0.0;   //to store the average of all numbers in the file

    int number ; //stores numbers in a file

                 

        if(!file){   //if file could not be opened

           cout<<"Error opening file!\n";    }   //displays this error message

       

       while(file>>number){   //reads each number from the file till the end of the file and stores into number variable

           numCount++; //adds 1 to the count of numCount each time a number is read from the file          

           sum += number;  }  //adds all the numbers and stores the result in sum variable

           average = sum/numCount;  //divides the computed sum of all numbers by the number of numbers in the file

     

       cout<<"The number of numbers in the file: "<<numCount<<endl;  //displays the number of numbers

       cout<<"The sum of all the numbers in the file: "<<sum<<endl;  //displays the sum of all numbers

       cout<<"The average of all the numbers in the file: "<< average<<endl;  //displays the average of all numbers

       file.close();     }  //closes the file    

   

Explanation:

Since the random.txt is not given to check the working of the above program, random.txt is created and some numbers are added to it:

35

48

21

56

74

93

88

109

150

16

while(file>>number) statement reads each number and stores it into number variable.

At first iteration:

35 is read and stored to number

numCount++;  becomes

numCount = numCount + 1

numCount = 1      

sum += number; this becomes:

sum = sum + number

sum = 0 + 35

sum = 35

At second iteration:

48 is read and stored to number

numCount++;  becomes

numCount = 1+ 1

numCount = 2    

sum += number; this becomes:

sum = sum + number

sum = 35 + 48

sum = 83

So at each iteration a number is read from file, the numCount increments to 1 at each iteration and the number is added to the sum.

At last iteration:

16 is read and stored to number

numCount++;  becomes

numCount = 9 + 1

numCount = 10    

sum += number; this becomes:

sum = sum + number

sum = 674 + 16

sum = 690

Now the loop breaks and the program moves to the statement:

       average = sum/numCount;  this becomes:

       average = 690/10;

       average = 69

So the entire output of the program is:

The number of numbers in the file: 10                                                                                                           The sum of all the numbers in the file: 690                                                                                                     The average of all the numbers in the file: 69

The screenshot of the program and its output is attached.

5 0
3 years ago
Implement one array of the English alphabet (26 characters). a) Create a function, getLetters() to cast and generate the array.
WARRIOR [948]

#include <fstream>

#include <iostream>

#include <iomanip>

#include <cstring>

#include <cstdlib>

using namespace std;

// Function Declarations

void display(char alphabets[],int MAX_SIZE);

void reverse(char alphabets[],int MAX_SIZE);

void swap(char &ch1,char &ch2);

int main() {

 //Declaring constant

const int MAX_SIZE=26;

 

//Declaring a char array

char alphabets[MAX_SIZE];

 

//Populating the array with alphabets

for(int i=0;i<MAX_SIZE;i++)

{

 alphabets[i]=(char)(65+i);

 }

 

 cout<<"Original: ";

 display(alphabets,MAX_SIZE);

 reverse(alphabets,MAX_SIZE);

 cout<<"Reversed: ";

 display(alphabets,MAX_SIZE);

 return 0;

}

//This function will display the array contents

void display(char alphabets[],int MAX_SIZE)

{

 for(int i=0;i<MAX_SIZE;i++)

 {

    cout<<alphabets[i]<<" ";

 }

 cout<<endl;

}

//This function will reverse the array elements

void reverse(char alphabets[],int MAX_SIZE)

{

 int first,last;

 first=0;

 last=MAX_SIZE-1;

 

 while(first<last)

 {

   

    swap(alphabets[first],alphabets[last]);

    first++;

    last--;

   

 }

}

void swap(char &ch1,char &ch2)

{

 char temp;

 temp=ch1;

 ch1=ch2;

 ch2=temp;

6 0
2 years ago
Elisa and Josh need to access General Help. Elisa will press the F1 key. Josh will click on ? in the upper-right corner of the W
astraxan [27]
It will be elisa who will get to it
3 0
3 years ago
Read 2 more answers
Is a defense of a political position an argument
shutvik [7]

Answer:

yes

Explanation:

yyyyyyyyyyeeeeeeeeesssssss

8 0
3 years ago
How do professionals address their problems?
8090 [49]

Answer:

b, with grace and maturity

6 0
3 years ago
Read 2 more answers
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