Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN: 9780133594140
Author: James Kurose, Keith Ross
Publisher: PEARSON
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num 2 in c++

Transcribed Image Text:Develop a C++ function with following function prototype: double fileAvg(string fname); The function accepts the name of file as input and returns the average of the numbers in that file (the file is assumed to contain numbers only). Write a C++ main program that prompts the user to enter a file name that contains a set of numbers. The main program should calculate the average of the numbers in the file using the function fileAvg and display the returned value to the user.
Expert Solution
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Step 1

Program code:

//include the required header files
#include <iostream>
#include <fstream>
using namespace std;
//definea function to find average
double fileAvg(string fname)
{
//declare the required variables
int sum = 0;
int counter = 0;
int x;
// Open the input file using ifstream
ifstream inFile;
inFile.open(fname.c_str());
//if true
if (!inFile)
{
//print the statement
cout << "Unable to open file";
// terminate with error
exit(1);
}
// Read the numbers one by one and keep overwriting x with the last read number
while (inFile >> x)
{
// Add the last read number to "sum"
sum = sum + x;
// Increase counter by 1
counter++;
}
// Close the file
inFile.close();
// Return sum/counter which is the same as average of all the numbers that were read
return (double) sum/counter;
}
//define main
int main()
{
//declare variable for file name
string fname;
//propt the user to enter the file name
cout << "Name your file: ";
//scan for input
cin>>fname;
// Print the value returned by calling the function fileAvg with input fname
cout <<"Average: "<<fileAvg(fname) << endl;
}
Step 2

Program code #1:

Computer Engineering homework question answer, step 2, image 1

Step 3

Program code #2:

Computer Engineering homework question answer, step 3, image 1

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