?????(I/O)

1
?????(I/O)
2
???????

• ????(Standard Output, stdout) ?????????.
• ????((Standard Input, stdin) ?????????.

? ? ???? ? ? ???
? ? ? ? ? ? printf ??????????????? stdio.h
? ? ? ? ? ? puts ?????? stdio.h
? ? ? ? ? ? putchar ?????? stdio.h
? ? ? ? ? ? putch ?????? conio.h
? ? ? ? ? ? scanf ??????????????? stdio.h
? ? ? ? ? ? gets ????????? stdio.h
? ? ? ? ? ? getchar ????????? stdio.h
? ? ? ? ? ? getche ??????????????? conio.h
? ? ? ? ? ? getch ??????????????? conio.h
3
?????(printf??)

• printf??????????????????,??????
• printf(????")
• ??
• printf("Every day is working day.")
• printf("This number is 2.")
• ????

4
?????(printf??)-????????

• printf??????????????????,??????
• printf( ???? ??? ,??1,??2, )
• ???????????(???)?????.
• ???
• ?????????,??????
• ??
• printf(I have d cats., num)
• printf(This number is d.,2)
• printf(d,1/3)

??num3,???? I have 3 cats.
??? This is number two 2.
??? 0
5
????

• ???DevC,?????????????.
• includeltstdio.hgt
• int main(void)
• int a2
• int b3
• printf("I have d dogs and d cats\n", a, b)
• system(pause")
• return 0
• ????????

??????????
6
??????(scanf??)

• scanf??????????????,???????,??????
• scanf(???,??1,??2,)
• ????????????
• ??
• includeltstdio.hgt
• int main(void)
• int x,y
• printf("Please input two numbers\n")
• scanf("d d" ,x, y)
• printf("resultsd, d",x,y)
• system("pause")
• return 0
• /?????????????,???????????(????Tab?)??,?Ente
  r?,??????,?????????./

???????,????????????
7
??????(scanf??)

• includeltstdio.hgt
• int main(void)
• int x,y
• printf("Please input two numbers\n")
• scanf("d,d",x,y)
• printf("resultsd,d",x,y)
• system("pause")
• return 0
• /??????????????,??????,?????????/
• ???????????????,????Enter?,???????

8
printf()?scanf()????????
printf()?? scanf() ?? ????
c c ??
d d ?????
o o ?????
x x ??????
s s ??
f e ??(?????)
lf lf ??????(l???????)
e f ??(??e??)
9
???????
?????????????
getch( ) getche( ) getchar( )
????????? ? ? ?
?? Enter ? ?? ?? ?
?????? ??? ?? ??
include ? ? ?
?????? conio.h conio.h stdio.h
????? ??getch() ??getche() ??getchar()
10
???????

• ??????
• putchar()
• ????????????,????????????(stdio.h)
• ????? putchar(??)
• putch()
• ????????????,??????????????(conio.h)?????
  putch(??)

11
??????----??

• / ???????????? /
• include ltstdio.hgt
• includeltconio.hgt
• void main(void)
• char ch1,ch2,ch3
• printf(Please enter two characters\n)
  /?????????,??????buffer?/
• ch1getche()
• ch2getche()
• printf("\nThe first character is\n")
  /???????/
• putchar(ch1)
• printf("\nThe second character is\n")
  /???????/
• putchar(ch2)
• printf("\nPlease input a character\n")
  /????????,???enter????????/
• ch3getchar()
• printf("\nThe third character is\n")
• putchar(ch3)
• printf("\n\n\n")
• system("pause")

12
????????----??2

• / ?????? ,??????ASCII?/
• include ltstdio.hgt
• include ltstdlib.hgt
• int main(void)
• char ch / ???????? /
• / ?????????????? /
• printf("Please input a character ")
• scanf("c",ch)
• / ????????????ASCII? /
• printf("chc , ASCII code is d. \n", ch, ch)
• system("pause")
• return 0 / ?????? /

13
?????????

• includeltstdio.hgt
• int main(void)
• int num
• char ch
• printf("Please input a integer\n")
• scanf("d",num)
• printf("Please input a character")
• scanf("c",ch)
• printf("\nnumd,ASCII code of
  characterd\n",num,ch)
• system("pause")
• return 0

??ch??????enter(????)???????????????
14
?????????---????

• 1.?scanf()??c?????????????????.
• 2.??fflush(stdin)???????????.
• includeltstdio.hgt
• int main(void)
• int num
• char ch
• printf("Please input a integer\n")
• scanf("d",num)
• fflush(stdin)
• printf("Please input a character")
• scanf("c",ch)
• printf("\nnumd,ASCII code of
  characterd\n",num,ch)
• system("pause")
• return 0

15
????????----??3

• / ?????? /
• include ltstdio.hgt
• include ltstdlib.hgt
• int main()
• char name10 / ?????? /
• / ?????????????? /
• printf("What's your name ")
• scanf("s",name) /????,??????name???/
  
• printf("Hi s , How are you ?\n" , name)
  /???????/
• system("pause")
• return 0 / ?????? /