Check out the Solid description. Unless you ask for something more specific, it will be hard to help more. Single responsibility is the concept of a Class doing one specific thing (responsibility) and not trying to do more than it should, which is also referred to as High Cohesion. Classes dont often start out with … Read more
An algorithm is the description of an automated solution to a problem. What the algorithm does is precisely defined. The solution could or could not be the best possible one but you know from the start what kind of result you will get. You implement the algorithm using some programming language to get (a part of) a program. Now, … Read more
In simple words, a loop invariant is some predicate (condition) that holds for every iteration of the loop. For example, let’s look at a simple for loop that looks like this: In this example it is true (for every iteration) that i + j == 9. A weaker invariant that is also true is that i >= 0 && … Read more
I’m having a problem with a Windows Form application I’m building in C#. The error is stating “foreach statement cannot operate on variables of type ‘CarBootSale.CarBootSaleList’ because ‘CarBootSale.CarBootSaleList’ does not contain a public definition for ‘GetEnumerator’”. I can’t seem to understand what is causing this. This is the code that is throwing up the error: … Read more
The problem here is that you are including commands.c in commands.h before the function prototype. Therefore, the C pre-processor inserts the content of commands.c into commands.h before the function prototype. commands.c contains the function definition. As a result, the function definition ends up before than the function declaration causing the error. The content of commands.h … Read more
Eric Lippert has a nice blog post entitled What is this thing you call “thread safe”? about the definition of thread safety as found of Wikipedia. 3 important things extracted from the links : “A piece of code is thread-safe if it functions correctly during simultaneous execution by multiple threads.” “In particular, it must satisfy the need for … Read more
ui-sref stands for UI-Router state reference. It’s a way to change states/state params (as defined in using the $stateProvider in a config block using the ui.router module for AngularJS. You can read the ui-sref documentation here.
Move the to a cpp file. If you have it in a header, then every .cpp that includes it will have a copy and you will get the duplicate symbol error during the link.
The following function prints the powers of 2 from 1 through n (inclusive). This means that the function will compute 2^i where i = 1, 2, …, n, in other words, i can have values from 1 up to and including the value n. i.e n is Included in Inclusive If, on the other hand, your book had said: The following function prints the powers of … Read more
I am trying to relearn C++ after taking an intro course a few years ago and I’m having some basic problems. My current problem occurs when trying to use a friend function. Here is my code in 2 files. First: Second: The error I am getting is “multiple definition of `funct()’”. Am I using the … Read more