main( )

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?9? ?????

• ???????
• ????
• ???????
• ????

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??????

• ??
• ??????
• ??????????,????,???????
• ?????,???????????

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????

• ??????????????????????

main( ) ?????? ???
????????????????,??????,?????????? void
prn_instruction() void play()
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int main() prn_instruction() play()
return 0
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prn_instruction???

• prn_instruction?????????,???????????????????????

void prn_instruction() cout ltlt
"?????????????.\n" cout ltlt "???????,???.\n"
cout ltlt "?????,??,?????\n"
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play?????

• Play?????????,????,??????,??????????

void play() char flag y while (flag
Y flag y) coin ?????
??????? if (???? coin) ??????????
else ??????????
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play?????

• ????????0????,1????,?????????????0?1???
• ???????????????????,?????????????????????????????,
  ?????????????,????????,????0????1,?????????,??????
  ???????????????,????????????get_call_from_user?

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void play() int coin char flag 'Y'
srand(time(NULL)) //??????? while (flag 'Y'
flag 'y') coin rand() 2 /
RAND_MAX//???????? if
(get_call_from_user() coin) cout ltlt "???"
else cout ltlt "???" cout ltlt
"\n????(Y?y)?" cin gtgt flag
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get_call_from_user???

• ????????????????????????0?1,?????,????????

int get_call_from_user() int guess // 0
head, 1 tail do cout ltlt "\n??????(0????,1??
??)" cin gtgt guess while
(guess !0 guess !1) return guess
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????
?????????????. ???????,???. ?????,??,????? ??????
(0????,1????)1 ??? ????(Y?y)?y ??????(0????,1????
)6 ??????(0????,1????)1 ??? ????(Y?y)?n Press
any key to continue
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?9? ?????

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????

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?????????

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• ?????
• ??????
• ?????
• ???????????????????,??????????,????,????,????????
  ?????????,????????????????????

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??????
While (???? ! quit) switch(?????)
case paper, rock, scissor ????
????
???? case game
??????? case help ??????
default ???? ????
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????

• ??????selection_by_player
• ??????selection_by_machine
• ????compare
• ???????????report
• ??????prn_game_status
• ??????prn_help????

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???????

• ??????????,??????????
• enum p_r_s paper, rock, scissor, game,
• help, quit
• enum outcome win, lose, tie, error

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????

• ??????
• ??? main??
• ??????? selection_by_player?selection_by_machine
• ???? compare
• ???? report?prn_game_status?prn_help??

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Select?????

• selection_by_player????????????????????,???
• p_r_s selection_by_player()
• selection_by_machine??????????????????,??????,???
• p_r_s selection_by_machine()

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Compare?????

• compare?????????????????,?????
• ???????,??p_r_s???,??????????,??????? ?
• ???outcome compare(p_r_s, p_r_s)

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print?????

• prn_help???????????,???????????????,????????????
• Report????????,??????????????????????????????????
  ?????,???????
• prn_game_status???????????,??????????????????????
  ,???????

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print????????

• ????????????????Report?prn_game_status?????????
• Report??????????,prn_game_status???????????
• ???????????????????,????????????
• ????????????????????????????,??????????????
• ????????????????
• ??report?prn_game_status??????????????

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??????

• ?????,????????????????????????????????,??????inclu
  de??????
• ??,????????????????????
• ?????????????,???????????,????????????????????????
  ???????????,
• ???????????????????
• ifndef ???
• endif

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??????
ifndef _name_h define _name_h
??????????? endif
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?????????????
// ??p_r_s.h // ????????????,??????????????? if
ndef P_R_S define P_R_S include ltiostreamgt
include ltcstdlibgt include ltctimegt using
namespace std enum p_r_s paper, rock,
scissor, game, help, quit enum outcome
win, lose, tie, error outcome
compare(p_r_s player_choice, p_r_s
machine_choice) void prn_final_status()
void prn_game_status() void prn_help()
void report(outcome result) p_r_s
selection_by_machine() p_r_s
selection_by_player() endif
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??????
//??main.cpp // ????????????? include
"p_r_s.h" int main(void) outcome result
p_r_s player_choice, machine_choice // seed
the random number generator
srand(time(NULL))
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while((player_choice selection_by_player()) !
quit) switch(player_choice) case
paper case rock case scissor
machine_choice selection_by_machine()
result compare(player_choice,

machine_choice) report(result)
break case game prn_game_status()
break case help prn_help() break
default coutltlt " PROGRAMMER
ERROR!\n\n" exit(1)
prn_game_status() return 0
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select?????
//??select.cpp //??????selection_by_machine? //??
??selection_by_player????? include
"p_r_s.h" p_r_s selection_by_machine( ) int
select (rand( ) 3 / (RAND_MAX 1)) cout
ltlt " I am " switch(select) case 0 cout
ltlt "paper. " break case 1 cout ltlt "rock.
" break case 2 cout ltlt "scissor. "
break return ((p_r_s) select)
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p_r_s selection_by_player() char c p_r_s
player_choice prn_help() //?????? cout ltlt
"please select " cin gtgt c switch(c)
case 'p' player_choice paper cout ltlt "you
are paper. " break case 'r'
player_choice rock cout ltlt "you are rock. "
break case 's' player_choice scissor
cout ltlt "you are scissor. "break case 'g'
player_choice game break case 'q'
player_choice quit break default
player_choice help break return
player_choice
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Compare?????
//??compare.cpp //??compare????? include
"p_r_s.h" outcome compare(p_r_s player_choice,
p_r_s machine_choice) outcome result if
(player_choice machine_choice) return tie
switch(player_choice) case paper result
(machine_choice rock) ? win lose break
case rock result (machine_choice
scissor) ? win lose break case scissor
result (machine_choice paper) ? win lose
break default cout ltlt " PROGRAMMER
ERRORUnexpected choice!\n\n"
exit(1) return result
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Print?????
//??print.cpp //????????????? //?prn_game_status
,prn_help?report?? include "p_r_s.h" int
win_cnt 0, lose_cnt 0, tie_cnt 0 //???????
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void report(outcome result) switch(result)
case win win_cnt
cout ltlt "You win. \n" break case lose
lose_cnt cout ltlt "You
lose.\n" break case tie tie_cnt
cout ltlt"A tie.\n"
break default cout
ltlt " PROGRAMMER ERROR!\n\n"
exit(1)
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void prn_game_status() cout ltlt endl cout ltlt
"GAME STATUS" ltlt endl cout ltlt "win " ltlt
win_cnt ltlt endl cout ltlt "Lose " ltlt lose_cnt
ltlt endl cout ltlt "tie " ltlt tie_cnt ltlt
endl cout ltlt "Total" ltlt win_cnt
lose_cnt tie_cnt ltlt endl
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void prn_help() cout ltlt endl ltlt
"The following characters can be used\n"
ltlt " p for paper\n" ltlt " r
for rock\n" ltlt " s for
scissors\n" ltlt " g print the game
status\n" ltlt " h help, print this
list\n" ltlt " q quit the game\n"
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?9? ?????

• ???????
• ????
• ???????
• ????

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??????

• ??????????????????,?????????
• ??????????????????????????????????iostream????????
  ,cmath?????????????????????????
• ?????????????????????????????,????????,???????????
  ?????????????????????????,???????????????

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???????

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• ???????????,???????????????????????????
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• ??????????????

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????????
?9.1??,???????????????????????????????????????????
,?????????????????

• ????
• ?9.1?,???????0?1
• ?9.2?,???????0?2
• ??????,???????0?3?????0?9
• ?????????low?high??????
• int RandomInteger(int low, int high)
• ?????RandomInit()????????????

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????

• ??????????????????????????
• ????,??????????????,?????????????

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??????
//??Random.h //????????? ifndef
_random_h define _random_h //??RandomInit //??
RandomInit() //????????????? void
RandomInit() //??RandomInteger //??n
RandomInteger(low, high) //?????????low?high?????
?,??low?high int RandomInteger(int low, int
high) endif
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????

• ???????????????????????Random.h,??????Random.cpp?
  
• ???????
• ???????????????
• include?cpp?????????
• ?????????????,????????????????????????
• ?????????????????????????????

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//??Random.cpp //??????Random? include
ltcstdlibgt include ltctimegt include
"Random.h" //??RandomInit //????????????????????
? void RandomInit() srand(time(NULL))
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// ??RandomInteger // ????0?RAND_MAX???????high
- low 1 ? // ????????????????????,????low? //
???????????,???high?????i????? //(i?0?high-low),??
??low i int RandomInteger(int low, int high)
return (low (high - low 1) rand() /
(RAND_MAX 1))
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?9? ?????

• ???????
• ????
• ???????
• ????

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???? -- ????
?? ???? ???? ???
?? ?? 50 ???3?
?? ?? 20 ???6?
?? ?? 30 ?????
?? ?? 20 ??
?? ??? 20 ???9?
?? ?? 10 ???14?
?? ??? 30 ???3?
?? ??? 20 ???2?
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????????

• ?????tortoise?hare????????????
• ??????
• ???????????????????,?????????????????
• ???????70??

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?????
main() int hare 0, tortoise 0, timer 0
//timer????,?0???? while (hare lt RACE_END
tortoise lt RACE_END) tortoise
????????????????? hare
????????????????? ??????????????
timer if (hare gt tortoise) cout ltlt
"\n hare wins!" else cout ltlt "\n tortoise
wins!"
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????

• ???????????
• int move_tortoise()
• ???????????
• int move_hare()
• ??????????????
• void print_position(int timer, int tortoise,
  int hare)

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????

• ???
• ????
• move_tortoise
• move_hare()
• ????
• print_position

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???
include "Random.h" //?????? include
ltiostreamgt using namespace std const int
RACE_END 70 //??????? int move_tortoise() int
move_hare() void print_position(int, int, int)
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int main() int hare 0, tortoise 0, timer
0 RandomInit() //?????? cout ltlt
"timer tortoise hare\n" //???? while (hare lt
RACE_END tortoise lt RACE_END) tortoise
move_tortoise() //???? hare
move_hare() //???? print_position(timer,
tortoise, hare) timer if
(hare gt tortoise) cout ltlt "\n hare wins!\n"
else cout ltlt "\n tortoise wins!\n" return
0
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??????????

• ?????,???????????
• ????????0-9??????,????????0-4?,????????,5-6??
  ????,7-9???????????????????????????

?? 50
?? 20
?? 30
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Move??
// ???move.cpp include "Random.h"
//??????????? int move_tortoise() int
probability RandomInteger(0,9) //??0?9??????
if (probability lt 5) return 3 //?? else if
(probability lt 7) return -6 //?? else
return 1 //??
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int move_hare() int probability
RandomInteger(0,9) if (probability lt 2) return
0 //?? else if (probability lt 4) return -9
//??? else if (probability lt 5) return 14
//?? else if (probability lt 8) return
3 //??? else return -2 //???
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Print??
// ???print.cpp include ltiostreamgt using
namespace std void print_position(int timer,
int t, int h) if (timer 6 0) cout ltlt
endl //??6???? cout ltlt timer ltlt '\t' ltlt t
ltlt '\t' ltlt h ltlt '\n'
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??

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