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case 4:
weight[i++] = 4;
lcd_putchar('4');
break;

case 5:
weight[i++] = 5;
lcd_putchar('5');
break;

case 6:
weight[i++] = 6;
lcd_putchar('6');
break;

case 7:
weight[i++] = 7;
lcd_putchar('7');
break;

case 8:
weight[i++] = 8;
lcd_putchar('8');
break;

case 9:
weight[i++] = 9;
lcd_putchar('9');
break;

case 0xC: // C = 자연수 부분 입력
k = 1;
i = 0;
lcd_gotoxy(0,1);
break;

case 0xD: // D = 소숫점 부분 입력
k = 0;
i = 3;
lcd_gotoxy(4,1);
break;

case 15: // F = 나가기
mode = 1;
break;

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