How to Calculate the Average of Numbers from a File Using C++?

[ZakAttk1]

How do I use file streams to extract numbers from a file, add them up, and average them out?

 

[Coin]

http://pages.cs.wisc.edu/~hasti/cs368/CppTutorial/NOTES/IO.html

See under "File I/O"

 

[quicknote]

File streams and ifstreams are commonly used in programming to read data from files. In order to extract numbers from a file, you can use the ">>" operator in conjunction with a while loop to read each number from the file and store it in a variable. Then, you can add the numbers together using a sum variable and a loop, and finally, divide the sum by the total number of numbers to calculate the average.

Here is an example code snippet in C++:

#include <iostream>
#include <fstream>

using namespace std;

int main() {
// open the file
ifstream inputFile("numbers.txt");

// initialize variables
int num, sum = 0, count = 0;
double average;

// read numbers from file and add them to sum
while(inputFile >> num) {
sum += num;
count++;
}

// calculate average
average = (double)sum / count;

// print out results
cout << "The sum of the numbers is: " << sum << endl;
cout << "The average of the numbers is: " << average << endl;

// close the file
inputFile.close();

return 0;
}

In this example, we open the file "numbers.txt" using the ifstream object and use a while loop to read each number from the file and add it to the sum variable. We also keep track of the total number of numbers read using the count variable. Finally, we calculate the average by dividing the sum by the count and print out the results.

I hope this helps in using file streams to extract numbers from a file, add them up, and calculate the average. It is important to note that this is just one way to accomplish this task and there may be other approaches depending on the programming language and specific requirements.