blah.cpp

#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <string>

using namespace std;

void readFromFile() {
	string line;
	ifstream myfile ("tolstoy.txt");
	if (myfile.is_open())
	{
		while ( myfile.good() )
		{
			getline (myfile,line);
			printf(line.c_str());
		}
		myfile.close();
	}
	else printf("Unable to open file");
}


float calculateParam(int n, float*Uvix)
{
	/*float min = Uvix[0], max = Uvix[0];

	for(unsigned int i = 0; i < n; i++)
		if(Uvix[i]>max) max=Uvix[i];

	for(unsigned int i = 0; i < n; i++)
		if (Uvix[i]<min) min=Uvix[i];

	return max - min;*/
}

void writeToFile(int n, float* Uvix) {
	ofstream myfile;	
	myfile.open ("example.txt");
	for(int i = 0; i < n; i++) {
		myfile << Uvix[i] << endl;	
	}
	myfile.close();
}


int main(int argc, char** argv)
{
	while(true) {
		// read from console?
		const int action = (int)argv[1] - 48; 
		switch(action) {
			case 1: readFromFile(); break;
			case 2: float p = calculateParam(); break;
			// ... 
			default: printf("ERROR! Illegal # of operation. Choose number between 1 and 5."); break;
		}
	}
	return 0;
}