#include<stdio.h>
#include<stdlib.h>
#include<time.h>

void generar();

int main(void){
	generar();
	
	return 0;
}

void generar(){
	int guardar[6], numero=0, i=0, hora = time(NULL);
	srand(hora);

	for(; i<6; i++){
		numero = rand()%46;
		guardar[i] = numero; 
	}
}

#include <stdio.h>
#include <time.h>
#include <windows.h>

double performancecounter_diff(LARGE_INTEGER *a, LARGE_INTEGER *b);

int main(int argc, char *argv[]){
	LARGE_INTEGER t_ini, t_fin;
	double secs;
	int i=0;
	QueryPerformanceCounter(&t_ini);
	clock_t start = clock();
	printf("\n Para contar de 0 a 300.000.000 esta maquina tarda...");
	while(i < 300000000){
 		i++;
	}
	printf("\n\n Utilizando time.h......: %f segundos",
		  ((double)clock() - start) / CLOCKS_PER_SEC);

	QueryPerformanceCounter(&t_fin);
	secs = performancecounter_diff(&t_fin, &t_ini);
	printf("\n\n Utilizando windows.h...: %.16g milisegundos\n", secs * 1000.0);

	  return 0;
}

double performancecounter_diff(LARGE_INTEGER *a, LARGE_INTEGER *b){
	LARGE_INTEGER freq;
	QueryPerformanceFrequency(&freq);
	return (double)(a->QuadPart - b->QuadPart) / (double)freq.QuadPart;
}

//http://dacap.com.ar/blog/cpp/medir-el-tiempo-de-una-rutina/
#include <stdio.h>
#include <windows.h>

/* retorna "a - b" en segundos */
double performancecounter_diff(LARGE_INTEGER *a, LARGE_INTEGER *b){
	LARGE_INTEGER freq;
	QueryPerformanceFrequency(&freq);
	return (double)(a->QuadPart - b->QuadPart) / (double)freq.QuadPart;
}

int main(int argc, char *argv[]){
	int contador=0;
	LARGE_INTEGER t_ini, t_fin;
	double secs;

	QueryPerformanceCounter(&t_ini);
	while(contador <= 300000000){
		contador++;
		if(contador % 100000000 == 0){
			QueryPerformanceCounter(&t_fin);
			secs = performancecounter_diff(&t_fin, &t_ini);
			printf("%.16g milliseconds\n", secs * 1000.0);
			QueryPerformanceCounter(&t_ini);
		}
	}
  
	getchar();
	return 0;
}