. 217 CS217 C programming language

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517 101 LAB 6-1
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1. ?????? (variable)

• ??????????????????????????????????????
• ????????????????? (Naming Variable)
• ???????????????????????? (Naming Variable)
• ????????????????????? (Arithmatic) ?????? C
• ???????????????

3
????????????????? (Naming Variable)

• ????????? ?????? C ?????????????????
  ???????????? Case-Sensitive (?????????????????????
  ??????????????
• ?????????????)
• ???? main( ) ????????????? Main(
  ) ??? MAIN( )

4
???????????????????????? (Naming Variable)

• ????????????????????????????????, ??????
  ?????????????? _ ????????
• ?????????????????????? ???????? ???? _
  ??????????????????????????????????
• ???????????????????? 32 ????????
• ??????????????????? (Reserved Word) ?????? C ????
  int , for, do, printf ???

5
????????????????????? (Arithmatic)
6
???????????????

• ?????? C ?????????????????? ? ??????????? ???
  block (???? ) ???? ?????? block ???????????
  function ?????????????????????
  ???????????????????????? ???????????? ?
  ??????????? ??? block
• ????????????????????????

?????????? ??????????
???? ?????? i ??????????? int ????? int i
?????? realnum ????????????? float
????? float realnum
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???????????????????????????

• ????????????????????????????? ????????????????????
  ???????? ??????(statement) ???????? ????????????
  
• 1. ???????????????? ????
• int i
• int j
• int k
• 2. ???????????????????????? ???? int i, j,
  k

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??????????????????????????????????

• ?????? C ?????? (statement) ??????????????????
  ??????????????????????????????????????????
• ????????????
• ???? int i 5

?????????? ?????????? ???????????

• ???????????????????????? ????? ???????????????????
  
• ?????????
• ???? int i 5, k 3, y

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?????????????????????

• ????????? (statement) ?????? C
  ?????????????????????
• ?????? (statement) ??????????????????????????????
  ?? ???? int x
• ???? if (z gt b) printf(d,z)
  ????????
• ???????????????????????? ?? ???? C
• ????????????????????????????????????????????
  ????????????
• ?????????? ?????????? ?????????? ...
  ????????????
• 
  

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??????????? function ??????? printf()

• printf() ????????????????????????????????????????
  ?
• ??????????? stdio.h ??????????????????????????
  include
• ???? stdio.h ?????????????????????????
• ???? include ltstdio.hgt

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• ???????????? printf()
• 1. ????????????????????
• printf("Character_string")
• ???? printf("Hello World!")
• 2. ???????????????????????
• printf("Format_string", ??????)
• ???? printf(d,9999)

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printf("Format_string", ??????)

• Format_string
• 1. ??????????????????????
• ???? printf(Your age is d,age)
  
• 2. Escape Sequence
• ??? ?????????????????????????
  (??????????????????? \ )
• ???? printf(Your age is \n)
• 3. Format Specification
• ???????????????????????????????(????????????????
  ??? )
• ???? printf(Your age is d,age)

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????????????
14
2. Escape Sequence
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3. Format Specification
Escape Sequence
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??????????????????

• 1. ????????
• ???? printf(d,1234)
• 2. ???????????
• ???? printf(d,i)
• 3. ?????????????????
• ???? printf(d, 235)
• 4. ?????? return ??? function
• ???? printf(d, abs(-5))

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???????????????????? ??????????????
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???????? (Constant)

• ???????? ??? ???????????????????????????????????
  run ???????

• ????????????????????
• ???? 547, -1234, 4000000
• ???????????????? ????????????????????????
  
• ???? a, Z, ,
• ????????????????????
• ???? 12.456, -0.314, 1.23e01, 456.78e-10,
  4567.5E5
• ???????? ??????????????????? (string)
• ????????????????????????
• ???? C Language, 1234 , Hello Hi"

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???????????????????? ??? ????????????????????

• ?????????????????????? 2 ????
• 1. ??? const
• const lt????????????gt lt????????????gt
  lt????????gt
• ???? const int MAXBOUND 15
• 2. ??? define

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???????????? ?????????????????? main()
???????????? define ????

• define PI 3.1414
• define MAXVALUE 50
• main()
• const float RATE 1.5
• .

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????????????????

• ??? ???????????????????????????? ????????
  
• ???? a, Z, , , \n
• ????????????????? ????????????????
• char myChar A

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???????????????????????

• char ????????????? ??????????????? ?????????
  -127 ??? 128
• ?????????????????????? char
• ???? ??????????? a
• char ch a / ch ?????????
  97 /
• char myChar A / myChar ????????? 65 /

1. printf(d, myChar) ????????????
?2.printf(c, myChar) ???????????? ?
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??????????????????? (Character String)

• ??????????????????? ?????????????????????????????
  ?????
• ???? Pay, Give me ???????
• char myChar g,i,v,i,n,g,
  ,m,e,\0

????????????????? ???????????????????
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??????????????????????????

• char ????????????? ??????????????? ????????? -127
  ??? 128
• ??? Character Array ??????????????????????????
  (character string)

?????? (array) ??? ??????????????????????????????
???????????????????????? ????????????????????????
??? (element) ???????? ????? ?????????????
(subscript ???? index) ???????????????????
?????????? C ??????????????????????? 0
????????????????????? ??????
???? char arr15
?????????? ???????????????????????