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문제

EDSAC (ElectronicDelay Storage Automatic Calculator)은 프로그램을 주기억장치에 두고 실행할 수 있는 최초의 디지털 컴퓨터이다. EDSAC에는 가산기를 사용하는 명령어가 내장되어 있으며, 17비트 word 타입과 35비트 double word 타입을 기반으로 계산한다. 또한 입출력을 위해 5비트 텔레타이프 코드를 사용한다.

EDSAC 프로그램은 매우 간단한 어셈블리어로 만들 수 있다. 이 어셈블리어의 각 명령어는 문자 하나와 음이 아닌 십진수 주소값, 그리고 F나 D로 이뤄져 있다. F는 full word타입, D는 double word타입을 의미한다. 예를 들어 명령어 "A 128 F"는 가산기에 메모리 상에서 128 주소에 있는 full word 타입 변수값을 더하라는 의미이다. 이 연산은 이진수로 11100000100000000으로 표현된다. 앞의 11100은 "add"를 의미하는 5비트의 opcode이고, 다음 11비트 00010000000(=128)은 피연산자를 나타내며, 마지막의 0은 full word타입을 연산한다는 것을 의미한다. (double word 타입이라면 마지막 자리는 1이 된다.)

EDSAC 연산은 고정소수점 2의 보수 연산이지만, 단순한 정수 사칙연산이 아닌 현대 컴퓨터와 비슷한 방법으로 수를 연산한다. EDSAC의 연산 장치는 소수점이 가장 높은 자릿수(가장 왼쪽에 있는 자릿수)와 그 다음 자릿수(바로 오른쪽에 있는 자릿수) 사이에 있다고 가정한다. 따라서 17비트 word 타입 x의 표현 범위는 -1.0 ≤ x < 1.0이다.

이진수 표현
-1.0 10000000000000000
1/2 01000000000000000
3/4 01100000000000000
-1/2 11000000000000000

따라서 가능한 가장 큰 양의 실수는 01111111111111111 = 0.9999847412109375이고, 가장 작은 양의 실수는 00000000000000001 = 2^(-16) = 0.0000152587890625이다.

우연의 일치인지 의도적인 설계인지, opcode add 연산과 텔레타이프 코드 'A'는 11100으로 일치하며, subtract 연산과 'S' 역시 01100으로 일치한다. 또한 텔레타이프 코드로 표현할 수 있는 알파벳은 "PQWERTYUIOJ#SZK*?F@D!HNM&LXGABCV"로 모두 32자인데, 5비트 opcode로 표현할 수 있는 수의 개수도 32개이다. (텔레타이프 코드로 P는 00000, Q는 00001로 위 순서대로 증가하여 V는 11111으로 표현된다.) 이 특성 덕분에 EDSAC 어셈블러를 만들기가 쉬워졌다.

그러나 EDSAC 어셈블러에는 특별히 데이터 값을 표현하는 특별한 코드가 없다. 그래서 한 EDSAC 프로그래머는 일반 명령어를 데이터 값 표현에 쓰기로 했다. 예를 들어 상수 3/4(01100000000000000)는 “S 0 F로 표현되며, 1/3(약 00101010101010101)은 “T 682 D”로 표현된다. (T=00101, 682=010101010101)

EDSAC 명령어가 주어졌을 때 이를 해당하는 십진수로 출력하는 프로그램을 작성하시오.

입력

입력의 첫 줄에 테스트 케이스의 수 P(1 ≤ P ≤ 1000)가 주어진다. 각 테스트 케이스는 "c d s" 형태의 EDSAC 명령어가 한 줄에 주어진다. c는 EDSAC 알파벳 문자 한 개이며, d는 부호 없는 십진수(0 <= d < 2^11), s는 'D' 또는 'F'이다.

출력

각 테스트 케이스마다 입력으로 주어진 EDSAC 명령어에 해당하는 하나의 십진수를 sb.ddd...의 형태로 출력한다. s는 마이너스 부호이며 음수일 경우에만 쓴다. b는 1 또는 0이며, d는 십진수 자리(0-9)이다. 소수점 아래 자리는 최소 1자리 이상, 최대 16자리 이하이다. 끝의 필요없는 0(Trailing zeros)은 출력하지 않는다.

예제 입력 1

13
P 0 F
I 0 F
& 0 F
? 0 F
Q 1228 D
P 0 D
V 2047 D
* 2047 D
? 0 D
P 256 F
V 1536 F
T 682 D
T 54 F

예제 출력 1

0.0
0.5
-0.5
-1.0
0.0999908447265625
0.0000152587890625
-0.0000152587890625
0.9999847412109375
-0.9999847412109375
0.0078125
-0.015625
0.3333282470703125
0.31414794921875
[{"problem_id":"2678","problem_lang":"0","title":"\uc5d0\ub4dc\uc0ad \ub370\uc774\ud130 \ub514\ucf54\ub529\ud558\uae30","description":"<p>EDSAC (ElectronicDelay Storage Automatic Calculator)\uc740 \ud504\ub85c\uadf8\ub7a8\uc744 \uc8fc\uae30\uc5b5\uc7a5\uce58\uc5d0 \ub450\uace0 \uc2e4\ud589\ud560 \uc218 \uc788\ub294 \ucd5c\ucd08\uc758 \ub514\uc9c0\ud138 \ucef4\ud4e8\ud130\uc774\ub2e4. EDSAC\uc5d0\ub294 \uac00\uc0b0\uae30\ub97c \uc0ac\uc6a9\ud558\ub294 \uba85\ub839\uc5b4\uac00 \ub0b4\uc7a5\ub418\uc5b4 \uc788\uc73c\uba70, 17\ube44\ud2b8 word \ud0c0\uc785\uacfc 35\ube44\ud2b8 double word \ud0c0\uc785\uc744 \uae30\ubc18\uc73c\ub85c \uacc4\uc0b0\ud55c\ub2e4. \ub610\ud55c \uc785\ucd9c\ub825\uc744 \uc704\ud574 5\ube44\ud2b8 \ud154\ub808\ud0c0\uc774\ud504 \ucf54\ub4dc\ub97c \uc0ac\uc6a9\ud55c\ub2e4.<\/p>\r\n\r\n<p>EDSAC \ud504\ub85c\uadf8\ub7a8\uc740 \ub9e4\uc6b0 \uac04\ub2e8\ud55c \uc5b4\uc148\ube14\ub9ac\uc5b4\ub85c \ub9cc\ub4e4 \uc218 \uc788\ub2e4. \uc774 \uc5b4\uc148\ube14\ub9ac\uc5b4\uc758 \uac01 \uba85\ub839\uc5b4\ub294 \ubb38\uc790 \ud558\ub098\uc640 \uc74c\uc774 \uc544\ub2cc \uc2ed\uc9c4\uc218 \uc8fc\uc18c\uac12, \uadf8\ub9ac\uace0 F\ub098 D\ub85c \uc774\ub904\uc838 \uc788\ub2e4. F\ub294 full word\ud0c0\uc785, D\ub294 double word\ud0c0\uc785\uc744 \uc758\ubbf8\ud55c\ub2e4. \uc608\ub97c \ub4e4\uc5b4 \uba85\ub839\uc5b4 &quot;A 128 F&quot;\ub294 \uac00\uc0b0\uae30\uc5d0 \uba54\ubaa8\ub9ac \uc0c1\uc5d0\uc11c 128 \uc8fc\uc18c\uc5d0 \uc788\ub294 full word \ud0c0\uc785 \ubcc0\uc218\uac12\uc744 \ub354\ud558\ub77c\ub294 \uc758\ubbf8\uc774\ub2e4. \uc774 \uc5f0\uc0b0\uc740 \uc774\uc9c4\uc218\ub85c 11100000100000000\uc73c\ub85c \ud45c\ud604\ub41c\ub2e4. \uc55e\uc758 11100\uc740 &quot;add&quot;\ub97c \uc758\ubbf8\ud558\ub294 5\ube44\ud2b8\uc758 opcode\uc774\uace0, \ub2e4\uc74c 11\ube44\ud2b8 00010000000(=128)\uc740 \ud53c\uc5f0\uc0b0\uc790\ub97c \ub098\ud0c0\ub0b4\uba70, \ub9c8\uc9c0\ub9c9\uc758 0\uc740 full word\ud0c0\uc785\uc744 \uc5f0\uc0b0\ud55c\ub2e4\ub294 \uac83\uc744 \uc758\ubbf8\ud55c\ub2e4. (double word \ud0c0\uc785\uc774\ub77c\uba74 \ub9c8\uc9c0\ub9c9 \uc790\ub9ac\ub294 1\uc774 \ub41c\ub2e4.)<\/p>\r\n\r\n<p>EDSAC \uc5f0\uc0b0\uc740 \uace0\uc815\uc18c\uc218\uc810 2\uc758 \ubcf4\uc218 \uc5f0\uc0b0\uc774\uc9c0\ub9cc, \ub2e8\uc21c\ud55c \uc815\uc218 \uc0ac\uce59\uc5f0\uc0b0\uc774 \uc544\ub2cc \ud604\ub300 \ucef4\ud4e8\ud130\uc640 \ube44\uc2b7\ud55c \ubc29\ubc95\uc73c\ub85c \uc218\ub97c \uc5f0\uc0b0\ud55c\ub2e4. EDSAC\uc758 \uc5f0\uc0b0 \uc7a5\uce58\ub294 \uc18c\uc218\uc810\uc774 \uac00\uc7a5 \ub192\uc740 \uc790\ub9bf\uc218(\uac00\uc7a5 \uc67c\ucabd\uc5d0 \uc788\ub294 \uc790\ub9bf\uc218)\uc640 \uadf8 \ub2e4\uc74c \uc790\ub9bf\uc218(\ubc14\ub85c \uc624\ub978\ucabd\uc5d0 \uc788\ub294 \uc790\ub9bf\uc218) \uc0ac\uc774\uc5d0 \uc788\ub2e4\uace0 \uac00\uc815\ud55c\ub2e4. \ub530\ub77c\uc11c 17\ube44\ud2b8 word \ud0c0\uc785 x\uc758 \ud45c\ud604 \ubc94\uc704\ub294 -1.0 &le; x &lt; 1.0\uc774\ub2e4.<\/p>\r\n\r\n<table class=\"table table-bordered\" style=\"width:30%\">\r\n\t<thead>\r\n\t\t<tr>\r\n\t\t\t<th>\uac12<\/th>\r\n\t\t\t<th>\uc774\uc9c4\uc218 \ud45c\ud604<\/th>\r\n\t\t<\/tr>\r\n\t<\/thead>\r\n\t<tbody>\r\n\t\t<tr>\r\n\t\t\t<td>-1.0<\/td>\r\n\t\t\t<td>10000000000000000<\/td>\r\n\t\t<\/tr>\r\n\t\t<tr>\r\n\t\t\t<td>1\/2<\/td>\r\n\t\t\t<td>01000000000000000<\/td>\r\n\t\t<\/tr>\r\n\t\t<tr>\r\n\t\t\t<td>3\/4<\/td>\r\n\t\t\t<td>01100000000000000<\/td>\r\n\t\t<\/tr>\r\n\t\t<tr>\r\n\t\t\t<td>-1\/2<\/td>\r\n\t\t\t<td>11000000000000000<\/td>\r\n\t\t<\/tr>\r\n\t<\/tbody>\r\n<\/table>\r\n\r\n<p>\ub530\ub77c\uc11c \uac00\ub2a5\ud55c \uac00\uc7a5 \ud070 \uc591\uc758 \uc2e4\uc218\ub294 01111111111111111 = 0.9999847412109375\uc774\uace0, \uac00\uc7a5 \uc791\uc740 \uc591\uc758 \uc2e4\uc218\ub294 00000000000000001 = 2^(-16) = 0.0000152587890625\uc774\ub2e4.<\/p>\r\n\r\n<p>\uc6b0\uc5f0\uc758 \uc77c\uce58\uc778\uc9c0 \uc758\ub3c4\uc801\uc778 \uc124\uacc4\uc778\uc9c0, opcode add \uc5f0\uc0b0\uacfc \ud154\ub808\ud0c0\uc774\ud504 \ucf54\ub4dc &#39;A&#39;\ub294 11100\uc73c\ub85c \uc77c\uce58\ud558\uba70, subtract \uc5f0\uc0b0\uacfc &#39;S&#39; \uc5ed\uc2dc 01100\uc73c\ub85c \uc77c\uce58\ud55c\ub2e4. \ub610\ud55c \ud154\ub808\ud0c0\uc774\ud504 \ucf54\ub4dc\ub85c \ud45c\ud604\ud560 \uc218 \uc788\ub294 \uc54c\ud30c\ubcb3\uc740 &quot;PQWERTYUIOJ#SZK*?F@D!HNM&amp;LXGABCV&quot;\ub85c \ubaa8\ub450 32\uc790\uc778\ub370, 5\ube44\ud2b8 opcode\ub85c \ud45c\ud604\ud560 \uc218 \uc788\ub294 \uc218\uc758 \uac1c\uc218\ub3c4 32\uac1c\uc774\ub2e4. (\ud154\ub808\ud0c0\uc774\ud504 \ucf54\ub4dc\ub85c P\ub294 00000, Q\ub294 00001\ub85c \uc704 \uc21c\uc11c\ub300\ub85c \uc99d\uac00\ud558\uc5ec V\ub294 11111\uc73c\ub85c \ud45c\ud604\ub41c\ub2e4.) \uc774 \ud2b9\uc131 \ub355\ubd84\uc5d0 EDSAC \uc5b4\uc148\ube14\ub7ec\ub97c \ub9cc\ub4e4\uae30\uac00 \uc26c\uc6cc\uc84c\ub2e4.<\/p>\r\n\r\n<p>\uadf8\ub7ec\ub098 EDSAC \uc5b4\uc148\ube14\ub7ec\uc5d0\ub294 \ud2b9\ubcc4\ud788 \ub370\uc774\ud130 \uac12\uc744 \ud45c\ud604\ud558\ub294 \ud2b9\ubcc4\ud55c \ucf54\ub4dc\uac00 \uc5c6\ub2e4. \uadf8\ub798\uc11c \ud55c EDSAC \ud504\ub85c\uadf8\ub798\uba38\ub294 \uc77c\ubc18 \uba85\ub839\uc5b4\ub97c \ub370\uc774\ud130 \uac12 \ud45c\ud604\uc5d0 \uc4f0\uae30\ub85c \ud588\ub2e4. \uc608\ub97c \ub4e4\uc5b4 \uc0c1\uc218 3\/4(01100000000000000)\ub294 &ldquo;S 0 F\ub85c \ud45c\ud604\ub418\uba70, 1\/3(\uc57d 00101010101010101)\uc740 &ldquo;T 682 D&rdquo;\ub85c \ud45c\ud604\ub41c\ub2e4. (T=00101, 682=010101010101)<\/p>\r\n\r\n<p>EDSAC \uba85\ub839\uc5b4\uac00 \uc8fc\uc5b4\uc84c\uc744 \ub54c \uc774\ub97c \ud574\ub2f9\ud558\ub294 \uc2ed\uc9c4\uc218\ub85c \ucd9c\ub825\ud558\ub294 \ud504\ub85c\uadf8\ub7a8\uc744 \uc791\uc131\ud558\uc2dc\uc624.<\/p>\r\n","input":"<p>\uc785\ub825\uc758 \uccab \uc904\uc5d0 \ud14c\uc2a4\ud2b8 \ucf00\uc774\uc2a4\uc758 \uc218 P(1 &le; P &le; 1000)\uac00 \uc8fc\uc5b4\uc9c4\ub2e4. \uac01 \ud14c\uc2a4\ud2b8 \ucf00\uc774\uc2a4\ub294 &quot;c d s&quot; \ud615\ud0dc\uc758 EDSAC \uba85\ub839\uc5b4\uac00 \ud55c \uc904\uc5d0 \uc8fc\uc5b4\uc9c4\ub2e4.&nbsp;c\ub294&nbsp;EDSAC \uc54c\ud30c\ubcb3&nbsp;\ubb38\uc790 \ud55c \uac1c\uc774\uba70, d\ub294 \ubd80\ud638 \uc5c6\ub294 \uc2ed\uc9c4\uc218(0 &lt;= d &lt; 2^11), s\ub294 &#39;D&#39; \ub610\ub294 &#39;F&#39;\uc774\ub2e4.<\/p>\r\n","output":"<p>\uac01 \ud14c\uc2a4\ud2b8 \ucf00\uc774\uc2a4\ub9c8\ub2e4 \uc785\ub825\uc73c\ub85c \uc8fc\uc5b4\uc9c4 EDSAC \uba85\ub839\uc5b4\uc5d0 \ud574\ub2f9\ud558\ub294&nbsp;\ud558\ub098\uc758 \uc2ed\uc9c4\uc218\ub97c sb.ddd...\uc758 \ud615\ud0dc\ub85c \ucd9c\ub825\ud55c\ub2e4. s\ub294 \ub9c8\uc774\ub108\uc2a4 \ubd80\ud638\uc774\uba70 \uc74c\uc218\uc77c \uacbd\uc6b0\uc5d0\ub9cc \uc4f4\ub2e4. b\ub294 1 \ub610\ub294 0\uc774\uba70, d\ub294 \uc2ed\uc9c4\uc218 \uc790\ub9ac(0-9)\uc774\ub2e4. \uc18c\uc218\uc810 \uc544\ub798 \uc790\ub9ac\ub294 \ucd5c\uc18c 1\uc790\ub9ac \uc774\uc0c1, \ucd5c\ub300 16\uc790\ub9ac \uc774\ud558\uc774\ub2e4. \ub05d\uc758 \ud544\uc694\uc5c6\ub294 0(Trailing zeros)\uc740 \ucd9c\ub825\ud558\uc9c0 \uc54a\ub294\ub2e4.<\/p>\r\n","hint":"","original":"0","html_title":"0","problem_lang_tcode":"Korean"},{"problem_id":"2678","problem_lang":"1","title":"EDSAC \ub370\uc774\ud130 \ub514\ucf54\ub529\ud558\uae30","description":"<p>The world&#39;s first full-scale, stored-program, electronic, digital computer was the EDSAC (ElectronicDelay Storage Automatic Calculator). The EDSAC had an accumulator-based instruction set,operating on 17-bit words (and 35-bit double words), and used a 5-bit teletypewriter code for inputand output.<\/p>\r\n\r\n<p>The EDSAC was programmed using a very simple assembly language: a single letter opcodefollowed by an unsigned decimal address, followed by the the letter &#39;F&#39; (for full word) or &#39;D&#39; (for double word). For example, the instruction &quot;A 128 F&quot; would mean &quot;add the full word at location 128 to the accumulator&quot;, and would be assembled into the 17-bit binary value, 11100000100000000,consisting of a 5-bit opcode (11100 = &quot;add&quot;), an 11-bit operand (00010000000 = 128), and a single 0 bit denoting a full word operation (a 1 bit would indicate a double word operation).<\/p>\r\n\r\n<p>Although arithmetic on the EDSAC was fixed point two&#39;s complement binary, it was not mere integer arithmetic (as is common with modern machines). The EDSAC hardware assumed a binary point between the leftmost bit and its immediate successor. Thus the hardware could handle only values in the range -1.0 &lt;= x &lt; 1.0. For example:<\/p>\r\n\r\n<table class=\"table table-bordered\" style=\"width:329px\">\r\n\t<thead>\r\n\t\t<tr>\r\n\t\t\t<th>Value<\/th>\r\n\t\t\t<th>Binary Representation<\/th>\r\n\t\t<\/tr>\r\n\t<\/thead>\r\n\t<tbody>\r\n\t\t<tr>\r\n\t\t\t<td>-1.0<\/td>\r\n\t\t\t<td>10000000000000000<\/td>\r\n\t\t<\/tr>\r\n\t\t<tr>\r\n\t\t\t<td>1\/2<\/td>\r\n\t\t\t<td>01000000000000000<\/td>\r\n\t\t<\/tr>\r\n\t\t<tr>\r\n\t\t\t<td>3\/4<\/td>\r\n\t\t\t<td>01100000000000000<\/td>\r\n\t\t<\/tr>\r\n\t\t<tr>\r\n\t\t\t<td>-1\/2<\/td>\r\n\t\t\t<td>11000000000000000<\/td>\r\n\t\t<\/tr>\r\n\t<\/tbody>\r\n<\/table>\r\n\r\n<p>As you can see, the largest possible positive value was:<\/p>\r\n\r\n<p>01111111111111111 = 0.9999847412109375<\/p>\r\n\r\n<p>and the smallest possible positive value was:<\/p>\r\n\r\n<p>00000000000000001 = 2<sup>-16<\/sup>&nbsp;= 0.0000152587890625<\/p>\r\n\r\n<p>(This also happens to be the increment between successive values on the EDSAC).<\/p>\r\n\r\n<p>By a curious coincidence (or an elegant design decision), the opcode for the add operation (11100) was the same as the teleprinter code for the letter &#39;A&#39;. The opcode for subtract was the same as the teleprinter code for &#39;S&#39; (01100), and so on. This simplified the programming for the assembler (which, incidentally, was a mere 31 instructions long). The EDSAC teleprinter alphabet was &quot;PQWERTYUIOJ#SZK*?F@D!HNM&amp;LXGABCV&quot; (with &#39;P&#39; = 00000, &#39;Q&#39; = 00001, and so on, up to &#39;V&#39;= 11111).<\/p>\r\n\r\n<p>Unfortunately, the EDSAC assembler had no special directives for data values. On the other hand, there was no reason that ordinary instructions couldn&#39;t be used for this, thus, an EDSAC programmer desiring to reserve space for the constant 3\/4 (represented as 01100000000000000) would use theinstruction &quot;S 0 F&quot; and for 1\/3 (which is approximately represented as 00101010101010101) &quot;T 682 D&quot;, and so on.<\/p>\r\n\r\n<p>Your job is to write a program that will translate EDSAC instructions into the appropriate decimal fractions.<\/p>\r\n","input":"<p>The first line of input contains a single integer P, (1 &le; P &le; 1000), which is the number of data sets that follow. Each data set is a single line that contains N (the dataset number), followed by a space, followed by an EDSAC instruction of the form: c\u3141d\u3141s, where c is a single character in the EDSAC alphabet, d is an unsigned decimal number (0 &lt;= d &lt; 2<sup>11<\/sup>), and s is either a &#39;D&#39; or &#39;F&#39;. Note: \u3141 represents a single space.<\/p>\r\n","output":"<p>For each data set there is one line of output. It contains the exact decimal fraction represented by the by the EDSAC instruction, including a minus sign (for negative values). The format for the decimal fraction is: sb.ddd&hellip;, where s is an optional minus sign, b is either a 1 or 0, and d is any decimal digit (0-9). There must be at least 1 and at most 16 digits after the decimal point. Trailing zeros in the fraction must be suppressed.<\/p>\r\n","hint":"","original":"1","html_title":"0","problem_lang_tcode":"English"}]

출처

ICPC > Regionals > North America > Greater New York Region > 2011 Greater New York Programming Contest D번

  • 문제를 번역한 사람: arine
  • 잘못된 번역을 찾은 사람: bupjae