Para Crispin

Datos_BD.cpp

#include <bits/stdc++.h>
using namespace std;

FILE *fp;

struct datos{
	float media,varianza;
};

int stoi (const string &str) {
	stringstream ss(str);
	int num;
	if((ss >> num).fail()){ /*ERROR*/ } 
	return num;
}

int t_file(){
	int n = 0;
	char buff[255];
   	fp = fopen("BD_Vivienda.txt", "r");
   	fscanf(fp, "%s", buff); n++;
   	while(fgets(buff, 255, (FILE*)fp) != NULL) n++;
   	return --n;
}

int valN(int n){
	char buff[255];
   	fp = fopen("BD_Vivienda.txt", "r");
   	fscanf(fp, "%s", buff);
   	if(n == 1) return stoi(buff);
   	while(n--) fgets(buff, 255, (FILE*)fp);
   	return stoi(buff);
}

int main(){
	int n_rep, t_muestra;
	cout << "Num de Repeticiones pls -> "; cin >> n_rep;
	cout << "Num de Datos de las Muestras pls ->"; cin >> t_muestra;
	datos data[n_rep];
	int f_len = t_file();
	for(int i=0; i<n_rep; i++){
		cout << endl << "-----------------" << endl;
		cout << "MUESTRA [" << i+1 << "]" << endl;
		cout << "-----------------" << endl;
		float varnz[t_muestra];
		float prom = 0.0;
		for(int j=0; j<t_muestra; j++){
			int r = rand() % f_len + 1;
			cout << "Dato en " << r << " es: " << valN(r) << endl;
			varnz[j] = valN(r); prom += varnz[j];
		}
		data[i].media = prom/(float)t_muestra;
		float varfin = 0.0;
		for(int j=0; j<t_muestra; j++)
			varfin += pow(2,(varnz[j] - data[i].media));
		data[i].varianza = varfin/(float)t_muestra;
	}
	cout << endl << "Datos:" << endl;
	for(int i=0; i<n_rep; i++){
		cout << "Media de Muestra (" << i+1 << "): " << data[i].media << endl;
		cout << "Varianza de Muestra (" << i+1 << "): " << data[i].varianza << endl;
	}
	return 0;
}