If Pressed RA$3\text{'}$ button, what will happen?

void main$()\{$

unsigned short current$\_$duty, old$\_$duty, current$\_$duty$1,$ old$\_$duty$1$;

PORTA $=255$;

TRISA $=255$;

PORTB $=0$;

TRISB $=0$;

PORTC $=0$;

TRISC $=0$;

$PWM{1}_{\text{I}}$nit$(5000)$;

$PWM{2}_{\text{I}}$nit$(5000)$;

$//$ configure PORTA pins as input

$\frac{\frac{?}{?}}{?}$ set PORTB to $0$

$//$ designate PORTB pins as output

$//$ set PORTC to $0$

$//$ designate PORTC pins as output

$//$ Initialize PWM$1$ module at $5KHz$

$//$ Initialize PWM$2$ module at $5KHz$