cs201/08
Previous 07 loops
[ 07.html ]Hand in a question you want answered on chapter 3
Project 3 Due
Study pages 132-144 Advanced Loops
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Many programs need nested loops, process inputs, or are simulations.
3.9 Nested Loops
Two or more dimensions.Informal example
while(not full)
{
while(some ice cream left)
eat a spoonful;
get some more ice cream;
}//end while not full
![[Activity diagram/flow chart]](08nested.png)
Examples of Nested loops ch03/ [ triangle.cpp ] (pages 132-133).
Wall Paper: [ wp.cpp ] [ wp.png ]
3.10 Processing inputs
Good advice for reading data from the user.Advanced topic 3.4 The loop-and-a-half Problem
Study this now.Here is a quick example of loop-and-a-half: [ 08loop.cpp ] Here we want to read until the user inputs a something that is not a number or is a smaller number.
Productivity Hint 3.2 Redirecting input and output
Neat trick that works in Linux, MacOs, and MSWindows. Learn it!Advanced topic 3.5 End-of-file Detection
The first loop is a very simple and powerful way to process all the input data. Be ready to use it.Advanced topic 3.6 Clearing the Failure State of a stream
Later. But note -- after you discover cin.fail() is true with an if you must (1) handle the failure (think), and (2) clear the state of cin with cin.clear() before doing anything else with cin.
Random Fact 3.2 The Denver Airport Luggage Handling System
Just for fun... try [ watch?v=xx8f4x6C_KY ] (YouTube, 2:28 mins) and then you can go to [ ?page_id=2086 ] which analyses why this system failed.
3.11 Simulations
We will simulate somethings in the lab this quarter.Here is an improved version of [ buffon.cpp ] from pages 141-143.
Here [ piman.cpp ] is a simpler attempt at finding π by thowing darts at a square board and counting how many are inside part of a circle.