The tag has no wiki summary.

learn more… | top users | synonyms

1
vote
1answer
86 views

Emulate 12bit uint in c#

I recently had to do a codility test. The question itself was reasonably easy. take a string of numbers and +, * loop through it, if the character is a number, add it to a stack, if its an operation ...
0
votes
2answers
132 views

What is the best type to represent a number in java and why? [closed]

I am developing a dynamically typed, interpreted programming language, which is interpreted by a runtime written in Java. As Java is statically typed, I need to define how the numbers used in the ...
4
votes
2answers
118 views

What do you get when you cross a multi-precision integer with a floating-point number?

I'm working on adding multi-precision integers to the suite of numeric types in my APL interpreter, but I'm not sure what to do about the odd type-combinations that now arise. I now have the following ...
3
votes
1answer
130 views

What data type is this?

I have a list of items I am adding to, however this special list will delete anything past a given capacity. Note the order is maintained. For the life of me, I can't think of the name of such a ...
1
vote
2answers
94 views

To convert to accurate data types or maintain default type of string

Scenario: I have a web application that records and checks data against two temp tables (1 table being a temp source and the other being a destination for the application). These temp tables are ...
3
votes
1answer
505 views

What's the opposite of primitive?

In java, int, byte and boolean are primitives, while String is not. This can be contrasted with c where string is a primitive (essentially an array of chars). What is the term for types that ...
0
votes
1answer
62 views

Why use atomic vectors or matrices in R at all?

In reading Hadley Wickham's Advanced R I learned about the difference between atomic vectors and lists; and matrices/arrays and dataframes. This is something I hadn't really appreciated before, and ...
8
votes
2answers
1k views

Is using interfaces for datatypes an anti-pattern?

Suppose I have a various entities in my model (using EF), say User, Product, Invoice and Order. I am writing a user control that can can print the summaries of entity objects in my application where ...
3
votes
2answers
79 views

How to use scala case classes when delegation is needed

Let's assume in our application we want to model cars. We also want to model a car repository where we store some registered cars. How should that be modeled in scala? Here comes my approach: First, ...
1
vote
2answers
63 views

What Scala type to use for a list of meeting participants

I want to store a number of participants for a meeting. The order of them is not important. The only thing I want to make sure is, that I will be able to add and remove participants, use filter ...
17
votes
14answers
3k views

Is there ever a reason to use an array when lists are available? [closed]

It seems like List<T> in C# can do everything an array can do and more, and seems also just as efficient in memory and performance as an array. So why would I ever want to use an array? I'm ...
17
votes
4answers
2k views

Why do we have to mention the data type of the variable in C

Usually in C, we have to tell the computer the type of data in variable declaration. E.g. in the following program, I want to print the sum of two floating point numbers X and Y. ...
4
votes
3answers
152 views

How to track temporal changes in a database?

Imagine a software for theater owners. You can accept reservations for the different cinema halls. Each hall has a different number of seats. Say the owner wants to know how many people visited the ...
1
vote
0answers
31 views

Manual repetitive conversion between file types

Let's say i have an interest in file conversions, but everything should be made by hand and i have multiple output formats (say: csv and excel). Once i get contacted by a client, i have to link ...
9
votes
1answer
278 views

Do any notable C extensions include integer types whose behavior is independent of machine word size

An interesting characteristic of C compared with some other languages is that many of its data types are based upon the word size of the target architecture, rather than being specified in absolute ...
4
votes
2answers
153 views

Correct terminology in type theory: types, type constructors, kinds/sorts and values

In an answer to a previous question, a small debate started about correct terminology for certain constructs. As I did not find a question (other than this or that, which is not quite the right thing) ...
0
votes
1answer
116 views

comparison of an unsigned variable to 0

When I execute the following loop : unsigned m; for( m = 10; m >= 0; --m ){ printf("%d\n",m); } the loop doesn't stop at m==0, it keeps executing interminably, so I thought that ...
0
votes
2answers
144 views

Which layer should service errors be handled in?

I am coding in a multitier architecture in Java, and I perform a query to a web service. Is it better form for the errors returned by the service be handled in the data access layer or in the ...
2
votes
3answers
140 views

Knowing the range of variable types needed

So, if I (as the programmer) know that my value will never exceed a small number (say 100) because it is really just a counter-controlled loop or whatever, may I use short or char instead of int for ...
1
vote
2answers
146 views

Is there a stricter strtoull() in any ubiquitous C library?

I want a function that will interpret a string as a strictly unsigned integer, failing when the string overflows, represents a negative number, or does not represent a number. strtoull() does set ...
0
votes
1answer
154 views

Why are floats called “real numbers” in some languages?

Some programing languages, notably Pascal, have a type of numbers called "real". However, mathematically speaking, these types aren't real. For them to be "real", these types have to be able to ...
3
votes
2answers
253 views

How can a true Vector be implemented in Haskell?

How could a true Vector type be implemented in Haskell? In order for something to be a Vector, it has to be stored sequentially in memory, with O(1) random access. But Haskell hides its memory ...
6
votes
7answers
1k views

Why isn't there a next operation on enums?

In most popular programming languages like Java and C# there is a way to define enums, which are essentially datatypes with a fixed set of values, e.g. DayOfWeek. The problem is, given a value, e.g. ...
1
vote
4answers
447 views

Best datatype to store a ternary, or three-state variable

Disclaimer: I know that datatypes are a little bit subjective to which scripting/programming language you are using, I like to write in Python as a matter of preference; though I am happy to hear ...
1
vote
2answers
758 views

What is the underlying mechanism behind va_list and where is it defined?

http://www.cplusplus.com/reference/cstdarg/va_list/ According to the above link, va_list is an argument or parameter used in some macros - va_start, va_arg, va_end. These macros are present in the ...
0
votes
1answer
154 views

If a variable containing a function gave the function's return instead of a reference to the function, what would an array of functions return? [closed]

I'm creating a prototype scripting language similar to something like Javascript. In my language, every single reference to a variable is actually a function call (a getter function), whether it has ...
0
votes
2answers
175 views

What are and how do (data-) types work?

What is a "variable"/data type? How does a compiler / interpreter handle types? My specific concern has to do with the different types in lower and higher level languages. For instance in Python, ...
23
votes
11answers
3k views

Why do we still use floats? [duplicate]

I understand why floats served a purpose in the past. And I think I can see why they're useful in some simulation examples today. But I think those example are more exceptional than common. So I ...
1
vote
3answers
479 views

Is it bad practice to check object types with an identifying member variable?

Preamble: I am making a simple board game in C++, in which AI characters move around squares on the board. There are different types of squares, each inherited from an abstract class, each with ...
0
votes
1answer
176 views

Generic name for types and values [closed]

In computer science, what is the abstract common name of types and values (I mean an abstract "something" that can be a type or a value) ? To be more specific: If we have template <typename X> ...
1
vote
2answers
854 views

Assert equality in mstest when types may differ

I've been working on some MSTest automated test infrastructure, that is testing a tool that merges data sets into SQL Server database tables. The basic structure of the test is to: Define the ...
2
votes
2answers
101 views

Should I put the datatype of a class attribute in its name?

Most of my system's class attributes are just text, but in this case it makes more sense to place this particular class's attributes into one single hash (from a "keep the source code pretty" aspect). ...
1
vote
1answer
260 views

Improving the efficiency of containers with dynamically allocated objects

This is not strictly related to C++ but its type system serves to illustrate the problem well. Assume: We have a generic template Container<T> (such as a std::vector<T>) which stores an ...
2
votes
1answer
142 views

Is every object rounded to the same size in Java?

According to this answer every object in Java is of the same size? Is the answer talking about the object itself or the reference to the object? Here's the statement: every object size is rounded ...
6
votes
3answers
1k views

Why do some of object oriented languages let programmer use primitive types?

Why do some object oriented languages let the programmer use primitive data types? Aren't classes like Integer, Boolean, etc. enough?
16
votes
5answers
1k views

Would it make sense to use objects (instead of primitive types) for everything in C++?

During a recent project I've been working on, I've had to use a lot of functions that kind of look like this: static bool getGPS(double plane_latitude, double plane_longitude, double plane_altitude, ...
0
votes
2answers
179 views

Boolean-Integer Typecasting to Replace Conditional

When choosing a value based off of 2 boolean values in this format var foo:int; if (X){ foo = 50; } else if (Y){ foo = -50; } else { foo = 0; } I discovered that I can condense this ...
3
votes
4answers
1k views

Why many programming languages have only 2 data-structures: arrays and hashes?

Many programming languages have only those 2 structures, and even some languages that have more structures still only provide special syntax for those 2; usually, [] and {}. Why is this? Is there ...
21
votes
4answers
6k views

Why does Java not do type inference?

I have always wondered why Java does not do type inference given that the language is what it is, and its VM is very mature. Google's Go is an example of a language with excellent type inference and ...
2
votes
1answer
2k views

Java default Integer value is int

My code looks like this import java.util.Scanner; public class StudentGrades { public static void main(String[] argv) { Scanner keyboard = new Scanner(System.in); byte q1 = ...
1
vote
3answers
271 views

I want to create an open data format… but I don't really know what that is

I have found a need for a standardization for storage and recording of data relating to diabetes information (I don't think there's any, but I may have missed it). To that end I made this github ...
8
votes
4answers
341 views

Origin of structures and classes

What design and implementation issues did programmers have to solve when they decided first to use structures and classes? When did this happened and who were the pioneers behind these ideas? Note, ...
26
votes
9answers
27k views

What is meant by a primitive data type?

My understanding of a primitive datatype is that It is a datatype provided by a language implicitly (Others are user defined classes) So different languages have different sets of datatypes ...
2
votes
3answers
231 views

Web Development: is always Typing necessary or can type on demand work?

I realize this idea might seem really foreign but I started thinking about this a bit back. Far as web sites go, at least in my experience, there is far more time spent retyping things to a String ...
4
votes
5answers
1k views

Why disallow int-to-short assignment but allow multiplication and other math?

In Java, the following code does not compile: int val = 1; short shortVal = val; // Incompatible types Anyone know why Java chooses to complain about this assignment, instead of simply truncating, ...
8
votes
3answers
299 views

Examples of limitations in IT due to different bit length by design [closed]

I am teaching the course "Introduction in Programming" for the first-year students and would like to find interesting examples where the datatype size in bits, chosen by design, led to certain known ...
5
votes
3answers
288 views

Eliminating Dependencies vs Eliminating Redundancy

Upon my assignment to a project, I discovered that many message classes were received and then kept intact and passed around inside the receiving application. When these messages changed, code ...
13
votes
4answers
4k views

Why were short, int, and long invented in C?

I'm having trouble understanding, what were the exact purposes of creating the short, int, and long data types in C? The reason I ask is, it doesn't seem like their sizes are bounded -- they could be ...
1
vote
2answers
138 views

Does hierarchial inheritance belong to the past? [closed]

Recently it came to my attention that hierarchical inheritance may be a relic of thinking of classes as "structs with functions" rather than a product contract-driven mentality. Consider, as a simple ...
8
votes
4answers
718 views

Is integer used too much as a data type?

Do most application developers use signed integers in places where they really mean to use unsigned integers? I do it all the time, so do my co-workers. I haven't seen a lot of other extensive ...