char *obtenerInstruccion(char *operando,int x)
{
    int i;
    char *cadena = NULL,c[2];
    cadena = calloc(7,sizeof(char));
    for(i = x;operando[i] != ',';i++)
    {
        sprintf(c,"%c",operando[i]);
        strcat(cadena,c);
    }
    return cadena;
}

char *obtenerInstruccion(char *oper)
{
   char *rv;
   int i;
   int j;
 
   for (i = 0; oper[i] != '\0' && oper[i] != ','; i++)
      ;
 
   if (i == 0)
      rv = NULL;
   else if ((rv = malloc(i + 1)) != NULL){
      for (j = 0; j < i; j++)
         rv[j] = oper[j];
      rv[j] = '\0';
   }
 
   return rv;
}

char *obtenerInstruccion(char *oper)
{
   char *rv;
   size_t i = strcspn(oper, ",");
 
   if (i == 0)
      rv = NULL;
   else if ((rv = malloc(i + 1)) != NULL)
      sprintf(rv, "%.*s", i, oper);
 
   return rv;
}

case 1: //Opcion 1, Registrar Empleado
   //Datos del empleado
   cout << "Escribe el nombre del empleado" << endl;
   cin >> aux; // Para que?

string palabra;
 
// ...
 
while (cin >> palabra && palabra != "fin"){
   cout << palabra << endl;
 
   // ...
}

system("PAUSE >null");

#include <stdio.h>
#include <stdlib.h>
 
int fn(int i, ...);
 
int main(void)
{
   int i = 1;
   float x = 2.0F;
   float y = 3.0F;
 
   printf("%d\n", fn(i, x, y));
 
   return EXIT_SUCCESS;
}

#include <iostream>
using std::cin;
using std::cout;
using std::endl;
 
#include <string>
using std::string;
 
int main()
{
   string foo[4] = {
      "Aitor",
      "Lluvia",
      "Luna",
      "Azul"
   };
   size_t num_elem = sizeof foo / sizeof foo[0];
 
   for (size_t i = 0; i < num_elem; i++)
      cout  << foo[i] << endl;
 
   return 0;
}

#include <iostream>
using std::cout;
using std::endl;
 
#include <string>
using std::string;
 
#include <vector>
using std::vector;
 
int main()
{
   vector<string> foo = {
      "Aitor",
      "Lluvia",
      "Luna",
      "Azul"
   };
 
   for (auto i = 0; i != foo.size(); ++i)
      cout  << foo[i] << endl;
 
   return 0;
}

#include <stdio.h>
#include <stdlib.h>
 
#define NAME_IN   "datos.txt"
#define NAME_OUT  "salida.txt"
 
int main(void)
{
   FILE *in;
   FILE *out = NULL;
   int rv = EXIT_FAILURE;
   double num;
 
   if ((in = fopen(NAME_IN, "r")) == NULL)
      perror(NAME_IN);
   else if ((out = fopen(NAME_OUT, "w")) == NULL)
      perror(NAME_OUT);
   else {
      while (fscanf(in, "%lf", &num) == 1 && fprintf(out, "%f\n", num * 2.0) >= 0)
         ;
 
      if (!ferror(in) && !ferror(out))
         rv = EXIT_SUCCESS;
   }
 
   if (in != NULL)
      fclose(in);
   if (out != NULL)
      fclose(out);
 
   return rv;
}