// kent archie
#include <fstream>
#include <iostream>
using namespace std;

int
main(int argc, char * argv[])
{
	ifstream tin;   // input file
	ofstream tout;   // output file
	float sum=0,avg,temp;
	float maxtemp, mintemp;
	int count=1; // how many were read

	// the argv array contains strings of the data passed
	// from the command line.
	// argv[0] is a string that contains the name of the program.
	// If the program is run like this
	// filetemps tdata.txt tdataout.txt
	// then the array looks like:
	// argv[0] = "filetemps"
	// argv[1] = "tdata.txt"
	// argv[2] = "tdataout.txt"
	// and argc contains the number of arguments, in this case 3.
	// To use this, it is always wise to check the number of arguments
	// is what you expect.
	
	if(argc != 3) {
		cerr << "Usage: filetemps infilename outfilename" << endl;
		exit(1);
	}
	tin.open(argv[1]);
	tout.open(argv[2]);

	while(tin)  // loops until file is empty
	{
	  tin >> temp;
	  // set the initial max and min values to
	  // the first temp. This will work correctly
	  // regardless of the temp values.
	  if(count == 1) {	
		 mintemp = temp; maxtemp=temp;
	  }

	  if(temp > maxtemp)  // new greatest temp
			maxtemp=temp;
		if(temp < mintemp)  // new greatest temp
			mintemp=temp;
		sum += temp;
		count++;
	}
	tin.close(); // done reading the data

	avg=sum/count;
	// first write the report to the screen
	cout << "There were = " << count << " data points" << endl;
	cout << "minimum temp = " << mintemp << endl;
	cout << "maximum temp = " << maxtemp << endl;
	cout << "sum temp = " << sum << endl;
	cout << "avg temp = " << avg << endl;
	
	// Now write the report to the file
	tout << "There were = " << count << " data points" << endl;
	tout << "minimum temp = " << mintemp << endl;
	tout << "maximum temp = " << maxtemp << endl;
	tout << "sum temp = " << sum << endl;
	tout << "avg temp = " << avg << endl;
	tout.close(); // done writing the report

	return 0;
} // main