LV1

int main(void)
{
    int swt1 = 0;
    int swt2 = 0;
    int swt3 = 0;
    int state = 0;
    while (1)
    {
        if (P1 && swt1 != 1)
        {
            swt1 = ~swt1;
        }
        if (P2 && swt2 != 1)
        {
            swt2 = ~swt2;
        }
        if (P3 && swt3 != 1)
        {
            swt3 = ~swt3;
        }
        
        Delay;
        
        switch (swt1)
        {
            case 0:
            break;
            case 255:
            second++;
            swt1 = ~swt1;
            break;
        }
        
        switch (swt2)
        {
            case 0:
            break;
            case 255:
            {
                    switch (swt3)
                    {
                        case 0:
                            minute++;
                            swt2 = ~swt2;
                            break;
                        case 255:
                            minute = 0;
                            second = 0;
                            swt2 = ~swt2;
                            break;
                    }
            }
            break;
        }
        
        switch (swt3)
        {
            case 0:
            state = 1; //Paused
            break;
            case 255:
                state = 2; //Counting
                minute--;
                second--;
        }
        printf();
    }
}