CSCE150A
Modularization
Methods to
Help
Examples
Computer Science & Engineering 150A
Problem Solving Using Computers – Laboratory
Lecture 06 – Modular Programming
Derrick Stolee
Spring 2009
1/9
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Guidelines and tips
Prepare for your exams
Study with the several resources on Docsity
Earn points to download
Earn points by helping other students or get them with a premium plan
Lecture Slides on Modular Programming | CSCE 150A, Study notes of Computer Science
Material Type: Notes; Class: PRBLM SOLVNG:COMPUTR; Subject: Computer Science and Engineering ; University: University of Nebraska - Lincoln; Term: Spring 2009;
Typology: Study notes
Pre 2010
1 / 9
This page cannot be seen from the preview
Don't miss anything!
Related documents
Partial preview of the text
Download Lecture Slides on Modular Programming | CSCE 150A and more Study notes Computer Science in PDF only on Docsity!
CSCE150A
Modularization Methods to Help Examples
Computer Science & Engineering 150A
Problem Solving Using Computers – Laboratory
Lecture 06 – Modular Programming
Derrick Stolee
Spring 2009
1 / 9^ [email protected]
CSCE150A
Modularization Methods to Help Examples
Break it up!
Big programs get BIG. Most software is many millions of lines of code. Organization is important
CSCE150A
Modularization Methods to Help Examples
Single Output Values
Usually, functions have a single return value. This is the only way to tell the “caller” any information* Parameters are pass by value, that is: values are copied. Consider the following definition: int func(int a) { a = 5; return 0; } What happens with the following code in main(): int b=1; int c = func(b);
CSCE150A
Modularization Methods to Help Examples
Multiple Output Values
We can pass values back to the caller more than just return! A parameter given by “type * name” is called a pointer. This is called pass by reference. We can set pointer values using (*name) = We pass an address to the function in the call using &variable. (see drawing on board)
CSCE150A
Modularization Methods to Help Examples
Example: Changing multiple values
See code sample ch6sam2.c The buyCoffee method returns the charge. Updates the total amount of coffee purchased (numCups) Checks for a coupon, or adds a coupon depending on number of cups.
CSCE150A
Modularization Methods to Help Examples
Example: Changing multiple values
See code sample ch6sam3.c The swapper method swaps the values if out of order. A sequence of calls to swapper sorts five variable values.