How do you solve fence post problems?
wiktionary.org provides a simple, clear definition of the fence post problem: If one wants to say “lay a fence post, then a length of fence, then repeat,” then a special case must be made for the final fence post.
How do you avoid off-by-one error?
Probably the best way to avoid off-by-one errors is encapsulation. For example, instead of using a for loop that iterates a collection by index (from 0 to count – 1), use a for-each style loop with all the logic of where to stop built into the enumerator.
What type of error is a logic error?
A logic error is classified as a type of runtime error that can result in a program producing an incorrect output. It can also cause the program to crash when running.
What are fencepost loops?
A fencepost loop is a common algorithmic pattern where you want to perform N tasks with N-1 things between them. It’s like a fence with N posts with N-1 wires between the posts. To achieve this, place one “post” outside your loop, then alternate between “wires” and “posts” inside the loop.
What is meant by off-by-one error?
An off-by-one error or off-by-one bug (known by acronyms OBOE, OBO, OB1 and OBOB) is a logic error involving the discrete equivalent of a boundary condition. It often occurs in computer programming when an iterative loop iterates one time too many or too few.
What is meant by logic error?
Logic errors occur when there is a fault in the logic or structure of the problem. Logic errors do not usually cause a program to crash. However, logic errors can cause a program to produce unexpected results.
How many posts does a fencepost error have?
A straight fence with n sections has n+1 posts. A fencepost error (occasionally called a telegraph pole, lamp-post, or picket fence error) is a specific type of off-by-one error. An early description of this error appears in the works of Vitruvius. The following problem illustrates the error:
What is an afencepost error?
fencepost error. 1. [common] A problem with the discrete equivalent of a boundary condition, often exhibited in programs by iterative loops.
What is the reverse error in fence design?
The reverse error occurs when the number of posts is known and the number of sections is assumed to be the same. Depending on the design of the fence, this assumption can be correct or incorrect. The following problem demonstrates the reverse error:
How many fence posts in a span?
Well, a span always touches an extra point, so ten segments means 11 posts. 11 fenceposts it is. But the problem isn’t natural for me – I have to think about spans vs points.