report_temperature.cpp

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#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include <iomanip>
using namespace std;
 
 
int main() {
    // ifstream is input file stream, ofstream is output file stream
    ifstream file;  // or ifstream file ("temperature.txt"); syntax also works
    file.open("temperature.txt");
    if (file.fail()) {
        cout << "Error in file opening!" << endl;
        exit(1);
    }
    ofstream average_file;
    average_file.open("average.txt");
    if ( average_file.fail() ) {
        cout << "Error in file opening!" << endl;
        exit(1);
    }
    string one_line;
    average_file << fixed << setprecision(1);
    // for each line
    while(getline(file, one_line)){
        string date;
        int count = 0;
        double sum = 0;
        istringstream line_stream(one_line);
        line_stream >> date;
        double temperature;
        // for each temperature in the line (total 24 temps)
        while(line_stream >> temperature){
            sum += temperature;
            count++;
        }
        double average = sum / count;
        average_file << date << " " << average << endl;
    }
    file.close();
    average_file.close();
    return 0;
}