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12
votes
5answers
2k views

Why is *declaration* of data and functions necessary in C language, when the definition is written at the end of the source code?

Consider the following "C" code: #include<stdio.h> main() { printf("func:%d",Func_i()); } Func_i() { int i=3; return i; } Func_i() is defined at the end of the source code and ...
17
votes
3answers
1k 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. ...
2
votes
4answers
138 views

Overwriting and returning the value of the argument used as conditional of an if statement, inside the same if statement

A simplified example: function logTheColor (color){ if(color == "red"){ color = "The color is red " } else if (color == "yellow") { color = "The color is yellow " } else { ...
0
votes
2answers
100 views

Prime symbol in Python variable name

So I'm a terrible person and I want to name a variable in my mathy-python3 code s′ (that's a prime symbol). I was under the impression Unicode literals work as identifiers in Python 3, which is why ...
0
votes
1answer
175 views

Is there a way to prevent variables from changing their type in Python?

It is useful to have the interpreter derive the type of a variable automatically. This on its own is similar to the auto keyword in C++11. However, in Python variables can change their type after ...
0
votes
1answer
68 views

Should instance variables be bound to the instance right in the beginning of the method they are created in?

A common problem for me - and it's not really a problem, but somehow I again and again ask myself, what is the normal way to handle this - is that there is a method and within this method a couple of ...
0
votes
1answer
90 views

Why does this function work even though the vars are different

$inumber1 = 10; $inumber2 = 20; function add($number1, $number2) { echo $number1 + $number2; } add($inumber1, $inumber2); I'm learning PHP coding for the first time and I'm ...
-2
votes
2answers
123 views

php make dollar optional [closed]

Is there any reason the PHP language could not be updated in a future version to make the $ prefix on variable names optional? Reasons that would break existing code? I'm thinking it would still be ...
4
votes
6answers
241 views

Should I store x,y coordinates as an array, a class object, or two variables?

I have a MyObject which has an x and y coordinate. as far as I can see, I can store it in three ways: class MyObject: def __init__(self, x, y): self.x = x self.y = y class ...
1
vote
2answers
148 views

Should I sacrifice code succintness to ensure the narrowest variable scope? [duplicate]

In many languages (e.g. both Perl and Java - which are the two languages I work most with) it is possible to narrow the scope of local variables by declaring them within a block. Although it adds ...
-1
votes
5answers
192 views

Representation of a question mark in variable names [closed]

I once in my childhood read a SF story in which it was assumed that the capital letter 'P' would be a good representation for a question mark, if you cannot use that character directly, eg. in ...
3
votes
2answers
347 views

Why to declare a String (as final) and then use it?

In a typical spring mvc validator class, while inserting an errorCode value in the Errors object, what difference does it make between using a String (props.somefield.req) like so ...
2
votes
1answer
326 views

Why is mixing plural with singular and camel case with underscores in cake php naming convention better than a simpler convention? [closed]

I have been using cake php for over a year and generally I like it but I struggle to understand the advantages of the complex naming conventions over something simpler. Cake uses plural here and ...
1
vote
4answers
215 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 ...
2
votes
1answer
1k views

Where should variables be declared [duplicate]

Considering I have a for loop in a method of a class. Should the incremented variable be declared as member of the class, or should it be declared in the method it uses it(or even in the for loop, ...
0
votes
3answers
319 views

Isolating unit tests in python

As a 30-year software developer, mostly in OO languages, but a newbie at python, I'm looking to find what is best practise for isolating unit tests in python. Let's say I have the following, ...
1
vote
2answers
291 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 ...
6
votes
5answers
371 views

Using π, φ, λ etc. as variable names while programming? [duplicate]

This is a function in the d3.v3.js file (the graph library D3.js): function d3_geo_areaRingStart() { var λ00, φ00, λ0, cosφ0, sinφ0; d3_geo_area.point = function(λ, φ) { ...
2
votes
1answer
54 views

When should I pass setting-like value as class' variable and when as an assoc. array?

Following my other question, is there a general rule of thumb, when we should pass a setting-like value, that controls class' behavior (for example displayed texts) as as class' constant or variable, ...
1
vote
1answer
98 views

When should I pass value as class variable and when as a method argument?

Is there a general rule of thumb, when we should pass a value as as class variable and when as a method argument? Or is it just a choice of the developer? For example -- are there any reasons, why ...
1
vote
2answers
91 views

Scope vs Visiblity vs Lifetime vs Accessibility vs etc

I have been trying to understand what it means to say "scope of a named entity". In reading about scope, there are terms like visibility, lifetime, accessibility and more that are used. What is ...
2
votes
2answers
167 views

Is there a difference between declaring variables outside or inside a loop? [closed]

Is there any difference if I were to write something like this: int row,col; for(row = 0; row < data.length; row++){ for(col = 0; col < data[row].length;col++){ //do ...
5
votes
7answers
2k views

How important is to initialize a variable

How important is it to initialize variables? Does proper initializing avoid memory leaks or have performance advantages?
1
vote
4answers
633 views

How should you cleanly restrict object property types and values in Python?

I have been learning python from no long time ago. But nearly at the beginning I stumbled on simple question: how to set a restriction (limitation) on object value or object's properties without ...
0
votes
1answer
516 views

When to use (Or not) C# myVariable { set; get; }

I have been trying to wrap my head around the finer points of this today. Essentially I have fallen in love with this format for booleans: Class { public static bool myBool {set; get;} private ...
1
vote
3answers
272 views

“state” or “status”? When should a variable name contain the word “state”, and when should a variable name instead contain the word “status”? [closed]

Reading code and discussions pertaining to code, I often see the words "state" and "status" used interchangeably, but the following tendencies seem to exist: When a variable holds a value intended ...
2
votes
2answers
192 views

How to pass parameters to a function in C

Suppose I'm writing a program in C in which several parameters are asked at the beginning of the execution to the user and then remain costant until the end. Now, I need to pass these parameters to ...
2
votes
2answers
834 views

Recommended guidelines for declaring bash/sh variables

I have been programming in BASH for a while now and the scripts that I write are starting to get more complicated. I realized that I started to bring in some habits from C/C++ and wanted to get ...
0
votes
5answers
607 views

Changing a variable through a series of statements … What is this technique called?

I'm looking at a function that that has several statements like this: n = returnDifferentVersionOf(n); I.e., the value of the same variable n changes progressively several times during the course ...
20
votes
2answers
2k views

When did the term “snake case” come into use? [closed]

Many people use the term Snake Case to describe variables or other symbols with_the_form_of_underscores. In the past week, I've launched several broad searches. I can't find anything about the origin ...
0
votes
1answer
146 views

Translating variables into english [closed]

I have recently came across some code where the variable names are in french, I could not use google translate because only part of the code needs translated, and it would not be that practical to ...
2
votes
0answers
59 views

Multiple meanings for one variable? [duplicate]

I'm replacing a guy who was in his first job as a programmer. You'd think being fresh out of school means the basics are fresh in one's mind, but think again. The code base is horrible, Ctrl+C / ...
2
votes
1answer
864 views

What is the difference/ advantage of doing double assignment?

Is there any advantage / is it a bad practice in Java to do the below x = x = 5 I saw it in one of my peers code and I was surprised why he would do double assignment? Is this something that is ...
1
vote
4answers
264 views

Is there a concept of a variable with phases of initialization: uninitialized, initializing, immutable?

I was looking at this thread on Stack Overflow and thinking about the functional programming I've been learning, and how immutability is so key there, and it occured to me that maybe some language has ...
9
votes
11answers
3k views

What is the reason for using lowercase for the first word in a local variable (eg, employeeCount, firstName)

I take a good deal of criticism from other programmers due to my use of full proper casing for all my variables. For example, your typical programmer will use employeeCount for a variable name, but I ...
15
votes
1answer
705 views

Dollar Sign Blues: Javascript and PHP

I grew up programming C++ and Java where everything was safe and beautiful. Compilers made sure to keep me in check if I ever strayed. Of course, everyone did a little Perl in college, but I didn't ...
2
votes
1answer
153 views

What are the pros and cons of temporary variables vs multiple returns [duplicate]

Take the following examples: public static String returnOnce() { String resultString = null; if (someCondition) { resultString = "condition is true"; } else { resultString ...
1
vote
4answers
546 views

“Is” prefix and “On” suffix as reasonable exceptions to a “non-hungarian” naming standard?

First, I believe I've seen this question discussed here before, but I cannot find it. My apologies if you do find it. I'm starting a new project, and trying to figure out why IsResolved and/or ...
8
votes
3answers
245 views

Is a single object to be preferred over multiple variables?

It was quite hard to put what I meant into a title, but it's easy to put into code. C++ Is this int offset_x = 10; int offset_y = 40; ... element.move(offset_x, offset_y); To be preferred over ...
1
vote
5answers
370 views

Why do some programmers keep values in global variables or member variables but not reused?

I am talking about normal PC applications, memory should be sufficient. They declare global or member variables. In each function/method, they use the same global/member variables. At the beginning ...
13
votes
10answers
3k views

How to write useful Java programs without using mutable variables

I was reading an article about functional programming where the writer states (take 25 (squares-of (integers))) Notice that it has no variables. Indeed, it has nothing more than three ...
67
votes
6answers
6k views

Should the variable be named Id or ID?

This is a bit pedantic, but I've seen some people use Id as in: private int userId; public int getUserId(); and others use: private int userID; public int getUserID(); Is one of these a better ...
7
votes
5answers
270 views

Programming principles with regard to software (computational) efficiency and the use of variables

I'm classically trained psychologist, not a programmer, so sometimes the more advanced aspects of programming escape me, in particular regarding program efficiency and/or certain best practices, in ...
41
votes
7answers
3k views

How to name a variable when the word is both a noun and a verb

I have run into a corner-case problem with the general guidance of: nouns for variables verbs for functions Specifically, I have a case where the word is ambiguous - it can be either a verb or a ...
9
votes
7answers
1k views

Temporary variables vs line length requirements

I've been reading Martin Fowler's Refactoring. It is generally excellent but one of Fowler's recommendations seems to be causing a little trouble. Fowler recommends that you replace temporary ...
4
votes
4answers
2k views

Stack and heap - dynamic allocation question

Sources usually mention that dynamically created variables are allocated on the heap, while functions' variables on the stack. Also the ones on the stack cease to exist automatically when e.g. the ...
5
votes
1answer
460 views

Do there exist programming languages where a variable can truly know its own name?

In PHP and Python one can iterate over the local variables and, if there is only once choice where the value matches, you could say that you know what the variable's name is, but this does not always ...
2
votes
1answer
270 views

Effective handling of variables in non-object oriented programming

What is the best method to use and share variables between functions in non object-oriented program languages? Let's say that I use 10 parameters from DB, ID and 9 other values linked to it. I need ...
7
votes
3answers
5k views

Does it make a difference if I declare variables inside or outside a loop in Java? [duplicate]

Possible Duplicate: Where do you declare variables? The top of a method or when you need them? Does it make a difference if I declare variables inside or outside a loop in Java? Is this ...
-3
votes
3answers
305 views

In what practical ways is it good to remember the memory/pointers model? [closed]

A variable refers to a value. A variable is also stored in a memory address. People say that it's good to have this memory model in mind. Is that true? What is some sample code that shows this as ...