Chapter 3 -Part I - Lecture Notes

Chapter 3 -Part I - Lecture Notes - Chapter Chapter 3 –...

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Unformatted text preview: Chapter Chapter 3 – – Functions . Part I Part I Ideas: 1. Functions are the result of a technique called: “Divide-and-Conquer” which allows the construction of large programs from small pieces called functions . 2. Writing a function is a three-step process: a. function prototype b. function call c. function definition 3. Function prototype, tells the compiler: a. the type of the data returned by the function {type of the result} b. the type of the parameters the function expects to receive c. the number the parameters d. The order in which the parameters are expected to be passed to the function. 4. The parameters of a function are local variables to that function. 5. Defining a function parameter again as a local variable in the function is a syntax error. 6. A function that does not return anything has a void return-type. 7. If nothing is written for the return-value-type of the function, then the compiler assumes it is int . 8. Even if int is assumed implicitly, always write int explicitly when the return-value-type expected is an integer. An exception to this rule is for function main () , for which the return-value-type can be omitted. 9. When the function has a return-value-type and the body of the function does not return any value, an error is generated by the compiler....
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This note was uploaded on 01/27/2010 for the course DS csc 270 taught by Professor Dr.m.g during the Spring '10 term at Notre Dame University-Louaize.

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Chapter 3 -Part I - Lecture Notes - Chapter Chapter 3 –...

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