#include "mbed.h"

// leds 배열
DigitalOut leds[] = {(LED1), (LED2),(LED3), (LED4)};

int main() {

    leds[0] = 0;
    leds[1] = 0;
    leds[2] = 0;
    leds[3] = 0;

    while(1) {

    leds[0] = 1;
    leds[1] = 0;
    leds[2] = 0;
    leds[3] = 0;
    wait(0.5);

    leds[0] = 1;
    leds[1] = 1;
    leds[2] = 0;
    leds[3] = 0;
    wait(0.5);

    leds[0] = 0;
    leds[1] = 1;
    leds[2] = 1;
    leds[3] = 0;
    wait(0.5);

    leds[0] = 0;
    leds[1] = 0;
    leds[2] = 1;
    leds[3] = 1;
    wait(0.5);

    leds[0] = 0;
    leds[1] = 0;
    leds[2] = 0;
    leds[3] = 1;
    wait(0.5);

    leds[0] = 0;
    leds[1] = 0;
    leds[2] = 0;
    leds[3] = 1;
    wait(0.5);

    leds[0] = 0;
    leds[1] = 0;
    leds[2] = 1;
    leds[3] = 1;
    wait(0.5);

    leds[0] = 0;
    leds[1] = 1;
    leds[2] = 1;
    leds[3] = 0;
    wait(0.5);

    leds[0] = 1;
    leds[1] = 1;
    leds[2] = 0;
    leds[3] = 0;
    wait(0.5);

    leds[0] = 1;
    leds[1] = 0;
    leds[2] = 0;
    leds[3] = 0;
    wait(0.5);

        }
    }