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Closed 10 years ago.
Just curious about the term vector in programming field?
Yes, here "vector" means a one-dimensional array. This is a bit confusing because to represent a mathematical vector also uses a one-dimensional array, to store the coordinates in each of the dimensions, but this is a different usage. In this case, "vector" bring up an image of all of the elements of the array laid out in a line.
If you're referring to C, C++ or Perl (all of which use the term "argv", though Perl is the only one in which it's usually capitalized as "ARGV"): yes, it means a one-dimensional array.
The term "vector" has other uses, but they're usually pretty close to "one-dimensional array" too. For instance, the C++ standard library defines a family of vector types, which behave like extensible arrays.
(There are other uses -- for instance, "interrupt vectors" -- that have nothing to do with this. I assume you aren't interested in those.)
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Closed 10 years ago.
I read that a running C program can be referred to as an "instance".
Is this really correct? The word instance is usually used for OOP.
And C also has "objects" hasn't it, but it's not the same as in OOP.
An "object" in C is just something in memory like a union with some value could be called an object can't it?
An "object" in C is just something in memory, but that's also true of all computer languages.
An object in real life is a thing that physically exists. Being in memory is the closest something in a program can come to physical existence, so we apply the same term.
An instance in real life is a specific example of a generic concept. The term has similar generality in computers. When you tell the computer to run a program, it generates an instance of that program, among many potential instances of running that program. Again, nothing specific to C, this terminology usually occurs in operating systems (which manage running of programs, and define what a "program" is).
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Closed 10 years ago.
For example, I have a file, which says
char,5
int,6
Reading the above file, is it possible to declare 2 variable array in the code? So in future
if i add a new line it will automatically declare?
No, not in C.
You will need to write a script which reads this file and writes the c program.
In short, what you need is a C Source Code Generator.
Sure, just code exactly what you want. You can start with a structure that can hold either a character or an integer (with some boolean or integer to indicate which). Then you can allocate an array of them of any size.
When you read the first line, create an array of 5 such structures. Set their type variable to "char".
When you read the second lien, increase the size by 6. Set those six new ones to be integers.
And so on.
You can use an enum to track the type of each entry in the array. You can use a struct to hold the integer value, character value, (or just re-use the integer value) and type. You can make helper functions like isInteger, setIntegerValue, getCharacterValue, and so on.
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Closed 11 years ago.
for sending variables to procedures what we should do in c and(or) pascal?
as i searched this work has to be done by BP( base pointer)
or rather i should say that BP do it,and one more thing is that C and Pascal are opposite of each other.
You question is entirely unclear. It would appear that you might be asking about C and Pascal calling conventions on the x86 architecture (at least your mention of BP hints at this).
If that's the case, I'd recommend you study the Wikipedia page on x86 calling conventions, and come back when you have specific questions.
edit You might also want to check out X86 Assembly/High-Level Languages along with the "Further Reading" links therein.
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Closed 11 years ago.
I am doing raytracing. I have not measured any performance numbers. I am thinking of making a separate C function for raytracing and then calling it from my matlab code.
Does it make the program perform better if instead of writing Matlab code?
If it is a well-written MATLAB code (meaning it takes advantage of matrix multiplication wherever possible) than MATLAB usually performs better than C. I remember a professor in college showing us MATLAB could beat even FORTRAN in calculating eigenvectors.
This is speaking typically though; there may be parts of your program that C could perform faster than MATLAB, although typically speaking MATLAB does just as well for well-written code. Here's an example of some very specific benchmarking done at MIT: http://www.ll.mit.edu/HPEC/agendas/proc03/pdfs/nehrbass.pdf
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Closed 10 years ago.
I am suppose to create a vector array in C to use in my project. I have not worked with such data structure before, and can't seem to find good information on it.
Can you provide a link to information or post the information which describes this data structure in regard to its usage, benefits, and the functions it has.
An implementation file would be also useful reference.
"... can't seem to find good information on it." Wat?
Google is pretty much king.
First understand what it is. Then implement based on what you research. You're going to need to understand not only what a vector is, but pointers and structs. Ask your instructor for help, or find a peer to work on this with.
It depends on what you mean by the terms. "Vector" has a very specific mathematical definition, but unfortunately without knowing what you goal is, "vector array" is sort of ambiguous because a vector is an array in a manner of speaking.
If you're doing mathematics in your software, you may actually want an array of vectors as opposed to an array aka vector. But, well, it depends on what you're looking to accomplish. (In my line of work, I need to deal with arrays of vector data, where the vectors are "locations" in 3D space.)
The shortest path would probably be to type:
Vector my_array[4];
...and see if that compiles. If it does not, then an array of Vector objects/structs is not available in your codebase. :)
Look into struct: C/C++ structures and classes.
Simple google search for vector array c
http://www.codecogs.com/d-ox/array/vector.php