Question

I need #5 done i cant seem to understand it. it must be written in c++

4. Numeric Processing Write a program that opens the file "random.txt", reads all the numbers from the file, and calculates and displays the following: a. The number of numbers in the file. b. The sum of all the numbers in the file (a running total) c. The average of all the numbers in the file numFile.cpp Notes: Display the average of the numbers showing 3decimal places 5. Download the file gradeBook.txt available through D21. The file contains an unknown number of students. Information for each student is displayed in two lines: The first line indicates the name of the student whitespaces are allowed. The second line shows the student's grade in a class. Write a program that prompts the user for the name of the file and displays a nicely formatted report showing: a. Student with the highest grade in the class Name and grade b. Student with the lowest grade in the class Name and grade c. Average grade in the class gradeBook.cpp

Answer 1

4)

random.txt (Save the file under D Drive.Then the path of the file pointing to it is D:\\random.txt )

23
45
32
99
89
33
77
99
11
39
92
56

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#include <iostream>
#include <fstream>
using namespace std;
int main()
{
//Declaring variables
int number,option,count=0,i=0;
double sum=0.0,average;
  
//fileInput reference
ifstream dataIn;

//Opening input file
dataIn.open("D:\\random.txt");
  
//this loop conitinues to counts the number of elements in the file
while(dataIn>>number)
{
count++;
}
//cout<<"Total No of Numbers in the file :"<<count<<endl;
dataIn.close();
  
//Creating an integer array
int filearr[count];
  
//Opening input file
dataIn.open("D:\\random.txt");
/* This loop continues to executes until it
* iterates over every number in the file
*/
while(dataIn>>number)
{
//Getting the number from the file and populates into an array
filearr[i]=number;
sum+=filearr[i];
//Incrementing the 'i' value by 1 every time
i++;
}
  
//calculating the average of all the numbers
average=sum/count;

//Displaying the results
cout<<"The number of numbers in the file :"<<count<<endl;
cout<<"The sum of all numbers in the file :"<<sum<<endl;
cout<<"The average of all the numbers in the file :"<<average<<endl;

return 0;
}
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Output:

C:Program Files (x86)\Dev-Cpp\MinGW64 bin\ReadFileUnknownNosSumAverage.exe The number of numbers in the file :12 The sum of all numbers in the file 695 The average of all the numbers in the file :57.9167 Process exited after 0.3323 seconds with return value Press any key to continue . - .

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5)