P04-SWITCH_LED.c

#include <mega16.h>

void main() {
    DDRC.3 = 1;
    DDRA.0 = 0;
    DDRA.4 = 0;
    PORTA.0 = 1;
    PORTA.4 = 1;

    while (1) {
        if (PINA.0 == 0 & PINA.4 == 0) {
            PORTC.3 = 1;
        } else {
            PORTC.3 = 0;
        }
    }
}