#include <iostream.h>
#include <string.h>
#include <stdlib.h>
int funcion( char * cadena[], int start,int length);



main()
{

char palabra[10]= "Prueba";



cout <<  funcion(palabra,1,3);


	return 0;
}

int funcion( char * cadena[], int start,int length)
{
	char * tmp;

	for (int n = start -1;n<start - length;n++)
	{
	strcat(tmp,cadena[n]);
	}

	return atoi(tmp);
}

funcion("Prueba",1,3) = "Pru"

char *funcion(char *string, int start, int final);

#include <iostream>
#include <cstring>
#include <cstdlib>

char * tmp;

strcat(tmp,cadena[n]);

char * strcat ( char * destination, const char * source );