CS31-3

CS31-3 - CS 31 Introduction To CS I 9/2009 John A Rohr All...

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Unformatted text preview: CS 31: Introduction To CS I 9/2009 John A. Rohr All Rights JAR 3-1 CS 31 : Introduction to Computer Science I Topic 3 Functions CS 31: Introduction To CS I 9/2009 John A. Rohr All Rights JAR 3-2 Functions Function Definition A function is a single unit of computation • Other words for function – Procedure – Method – Subprogram (that returns a value) CS 31: Introduction To CS I 9/2009 John A. Rohr All Rights JAR 3-3 Functions Function Characterization • Accomplishes one thing • May use other functions • May produce a result • Sequence of statements CS 31: Introduction To CS I 9/2009 John A. Rohr All Rights JAR 3-4 Functions Function Inputs • Called “arguments” or “actual parameters” • Provides values for calculation • Not needed by all functions – Display text – Generate random number CS 31: Introduction To CS I 9/2009 John A. Rohr All Rights JAR 3-5 Functions Function Outputs • Called the “return value” • Reports the results of the processing • Not produced by all functions – Functions that perform an action only CS 31: Introduction To CS I 9/2009 John A. Rohr All Rights JAR 3-6 Functions Function Processing • Apply defined algorithm • Use inputs • Generate outputs CS 31: Introduction To CS I 9/2009 John A. Rohr All Rights JAR 3-7 Functions Function Example • Square Root • Input: Value: 9 • Processing: Calculate square root • Output: Square root of value: 3 CS 31: Introduction To CS I 9/2009 John A. Rohr All Rights JAR 3-8 Functions Two Function Dichotomies • Function definition dichotomy – Predefined functions – Programmer-written functions • Function return value dichotomy – void – Typed (int, float, double, char, bool, etc.) CS 31: Introduction To CS I 9/2009 John A. Rohr All Rights JAR 3-9 Functions Function Definition Types • Predefined functions – Function library – Commercial product – Other programmers • Programmer defined functions – Written by programmer CS 31: Introduction To CS I 9/2009 John A. Rohr All Rights JAR 3-10 Functions Function Return Value Types • Functions that return a value (typed) – Perform a calculation (e.g. Square root) – Deliver (return) the result • Functions that do not return a value (void) – Perform an action (e.g. set an output format) – Do not have a result to return CS 31: Introduction To CS I 9/2009 John A. Rohr All Rights JAR 3-11 Functions C++ Predefined Functions • Provided by the compiler • Organized in libraries • Referenced by #include statements • Included in program using #include CS 31: Introduction To CS I 9/2009 John A. Rohr All Rights JAR 3-12 Functions Some Predefined Libraries • iostream Stream input and output • cmath Mathematical functions • cstdlib Some standard functions • cctype Character operations • string String capabilities CS 31: Introduction To CS I 9/2009 John A....
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CS31-3 - CS 31 Introduction To CS I 9/2009 John A Rohr All...

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