Unit 7: Functions - Tin học đại cương (IT1110) | Trường Đại học Bách khoa Hà Nội

Unit 7: Functions

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Môn: Tin học đại cương

Trường: Đại học Bách Khoa Hà Nội

Thông tin:

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Tác giả:

Profile Tin Hin
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Funcons
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Avoid rewring same logic/code again and again in a
Improve understandability of very large C programs.
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5
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Where to write funcon
denion?
• The funcon denion itself can act as an implicit
funcon declaraon.
• All ideners in C need to be declared before they
are used.That’s why funcon denions were put
before main. If the order was reversed the compiler
would not recognize the funcon.
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• To correct this a prototype could be added before
main.
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denion
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denion
with
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Funcon denion
Funcon-name: any valid idener
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Funcon denions
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s
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Avoids accidental changes
Call by reference
Changes in funcon eect original
For now, we focus on call by value
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Scope rules
Scope rules tell us if an enty (
, variable,
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Used for
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Used for
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The variable's scope is limited to the {} block that
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lOMoAR cPSD| 27879799 lOMoAR cPSD| 27879799 Functions lOMoAR cPSD| 27879799
Avoid rewriting same logic/code again and again in a
Improve understandability of very large C programs. 3
Downloaded by VietJack TV Official (vietjackvideos@gmail.com) lOMoAR cPSD| 27879799
functions with library functions lOMoAR cPSD| 27879799 Where to write function definition?
• The function definition itself can act as an implicit function declaration.
• All identifiers in C need to be declared before they
are used.That’s why function definitions were put
before main. If the order was reversed the compiler
would not recognize the function. 5
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• To correct this a prototype could be added before main. lOMoAR cPSD| 27879799 definition 7
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Function-name: any valid identifier 9
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Downloaded by VietJack TV Official (vietjackvideos@gmail.com) lOMoAR cPSD| 27879799 Avoids accidental changes Call by reference
Changes in function effect original For
now, we focus on call by value lOMoAR cPSD| 27879799 15
Downloaded by VietJack TV Official (vietjackvideos@gmail.com) lOMoAR cPSD| 27879799 Scope rules
Scope rules tell us if an entity ( , variable, lOMoAR cPSD| 27879799 Used for 17
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The variable's scope is limited to the {} block that lOMoAR cPSD| 27879799 20