#include <avr/io.h>
#include <string.h>


void xisa() {
	// doesn't work
	char aux[10] = {'A', 'A', 'A', 'A', 'A'} ;
	if ('A' == aux[2]) PORTB |= 0X01;   // 1st led
}


void xisb() {
	// doesn't work
	char aux[] = "BBBBBBB";	
	if ('B' == aux[2]) PORTB |= 0X02;   // 2nd led
}

void xisc() {
	// WORKS !!!!
	char aux[10];
	
	aux[0] = 'C';
	aux[1] = 'C';
	aux[2] = 'C';
	aux[3] = 'C';
	aux[4] = 'C';	
	aux[0] = '\0';
	
	if ('C' == aux[2]) PORTB |= 0X04; // 3rd led
}


void xisd() {
	// doesn't work
	char aux[10];
	aux[0] = '\0';
	strcat(aux, "DDDDDDDD");
	if ('D' == aux[2]) PORTB |= 0X08;   //4th led
}



void main(){
	/***************************************************
	*  I/O
	***************************************************/
	outp(0xff,DDRB);   // PORT B = OUTPUT	
	outp(0xff,PORTB);  // WRITE PORT	
	PORTB = 0x00;      // BLANKS PORT
		
	// TRY EACH OF THESE COMMANDS ALONE, 
	// and the problem persists
	xisa();  
	xisb();
	xisc();
	xisd();
	
	
	
}