The C Language

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The C Language
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History of C

• ? ? 1960 ? Algo 60 ? ? ( International Committe
  )
• ? ? 1963 ? CPL ? ? ( ? ? ? ? ? ? ? )
• ? ? 1966 ? BCPL ? ? ? ( ???? Martin Richards )
• ? ? 1970 ? B ? ? ( ATT Ken Thompson )
• ? ? 1972 ? C ? ? ( ATT Dennis Ritchie )

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Program I The happiness is
????

• include ltstdio.hgt
• include ltstdlib.hgt
• int main( )
• printf("?????? ")
• printf("??????????!\n ")
• system("PAUSE")
• return 0

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Program II 5 7 ? ????

• include ltstdio.hgt
• include ltstdlib.hgt
• int main()
• int a, b, c
• a 5
• b 7
• c a b
• printf("d d d\n", a, b, c)
• system("PAUSE")
• return 0

a
b
c
5
7
12
57
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Program III How old are you ?

• include ltstdio.hgt ????
• include ltstdlib.hgt
• int main( )
• int myage
• myage 16
• printf("I am d years old. \n", myage)
• printf("Next year, I will be d years old.
  \n", myage1)
• system("PAUSE")
• return 0

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How printf( ) work?

• printf("Hello")
• printf("Hello\n")
• printf("d", b)
• printf("The temperature is ")
• printf("d", b)
• printf(" degrees\n")
• printf("The temperature is d degrees\n", b)
• printf("d d d\n", a, b, c)

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????

• (character, ??) char
• (integer, ??) int
• (long integer, ???) long
• (short integer, ???) short
• (???) float
• (??????) double

?1 byte ?4 bytes ?4 bytes ?2 bytes ?4 bytes ?8
bytes
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How printf( ) work?

• int (??) uses d
• float (???) uses f
• char (??) uses c
• character strings(??)use s

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??

• ????????,??????????(?num????stud?????)
• ???????
• ????C???????
• ???????????????
• ??????????????
• ????????
• ???????????

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?????

•  

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???????????

• ??(??)
• ???? C 25
• ?
• ???? F
• ???(?? F 9/5 C 32)
• F (float)C 9 / 5 32
• ?????? F ?? xx.xx (.2f)

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??BMI (?)

• ??(??)
• ?? height 168
• ?? weight 55
• ?BMI
• ???
• BMI weight / (height)2
• (????????????????)
• BMI weight/(heightheight/10000)
• ???? BMI ??xx.xx (.2f)
• ????

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Program IV a b ? ????

• include ltstdio.hgt
• include ltstdlib.hgt
• int main()
• int a, b, c
• printf("Enter the first value")
• scanf("d", a)
• printf("Enter the second value")
• scanf("d", b)
• c a b
• printf("d d d\n", a, b, c)
• system("PAUSE")
• return 0

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Program V How old are you ?

• include ltstdio.hgt ????
• include ltstdlib.hgt
• int main()
• int yourage
• printf("How old are you?")
• scanf("d", yourage)
• printf("Next Year, you will be d years
  old.\n", yourage1)
• system("PAUSE")
• return 0

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How scanf() work?

• scanf("d", b)
• int uses d
• float uses f
• char uses c
• character strings use s
• scanf("d d", a, b)
• scanf("d,d", a, b)
• ?????????

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??BMI (?)

• ????(height), ??(weight)
• ???
• BMI weight / (height)2
• BMI weight / (height height)
• (????????????????)
• ????BMI??xx.xx
• 
  ????