/*AUTHOR: [phear]cripplerFILE: assignment5.cppPURPOSE: Take input from a file of numbers of type double and output the average of the numbers in the file to the screen.*/#include <iostream>#include <fstream> // I/O#include <iomanip> // For setw()using namespace std;ofstream outputfile("output.txt");const int MAX_FILE_NAME = 35; void open_input(ifstream& input, char name[]); void average(ifstream& input, double& av_rage);void output(const char name[], double av_rage, ostream& os = cout); int main() { char again; char file_name[MAX_FILE_NAME + 1]; ifstream input_numbers; double av_rage; cout << "This program can average the numbers in a file\n" << endl; system("pause"); do { system("cls"); open_input(input_numbers, file_name); average(input_numbers, av_rage); input_numbers.close(); output(file_name, av_rage); output(file_name, av_rage, outputfile); cout << "\nDo you want to process another file (Y/N)? "; cin >> again; cin.ignore(256, '\n'); } while ( again == 'y' || again == 'Y'); cout << "\nEnd of Program!" << endl; outputfile.close(); return 0; } void open_input(ifstream& input, char name[]) { int count = 0; do { count++; if (count != 1) { cout << "\n\aInvalid file name or file does not exist. Please try again." << endl; } cout << "\nEnter the input file name (maximum of " << MAX_FILE_NAME << " characters please)\n:> "; cin.get(name, MAX_FILE_NAME + 1); cin.ignore(256, '\n'); input.clear(); input.open(name, ios_base::in); } while (input.fail() );}void average(ifstream& input, double& av_rage){ double nxt, sum = 0; int count = 0; while(input >> nxt) { sum = sum + nxt; count++; } av_rage = sum / count;} void output(const char name[], double av_rage, ostream& os) { os << "\n\nInput File Name : " << name << endl; os << "Average = " << setw(8) << av_rage << endl;}