How to switch elements in an array in a single function ?

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Hi. I'm a bit of a newbie in C++, and I'v been working on a program from college and I got a little problem. The thing is, i need to enter 7 elements in a single array in one function, which I did. Now I have to find the smallest and the biggest element in the array and switch their places in another function. How do I do that ? (It is NO homework, it's my personal exercising) The function should look like this:

void switching(float array[], int v) //v is the const int size of the array

Help would be appreciated. :)

Posted 18-Feb-11 0:33am

Edin Kalabić

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Manfred Rudolf Bihy · Accepted Answer · 2011-02-18T01:08:00

Would look something like this:

C++

// method to switch two elements in an array
void switching(float[] array, int positionX, int positionY)
{
    float temp = array[positionX];
    array[positionX]  = array[positionY];
    array[positionY] = temp;
}

There you have a method that switches two elements in an array.
You'd call that from you other function like this:

...
switching(array, idxOfBiggest, idxOfSmallest);
...

where idxOfBiggest and idxOfSmallest are the indices of the biggest and the smallest array element.

Cheers!

CPallini · Accepted Answer · 2011-02-18T00:49:00

Solution 1

Option one:

Choose the sort algorithm, implement it.
Using the coded algo find max & min (say v[max], v[min]).

Swap v[max] and v[min] with the usual

C++

float tmp = v[max]; v[max] = v[min]; v[min] = tmp

You may replace point (1) with:
Use an existing sorting method, like, for instance STL sort[^].

Posted 18-Feb-11 0:49am

CPallini

Comments

Edin Kalabić 18-Feb-11 6:57am

Thank you, but I need to write the algorithm for it.

CPallini 18-Feb-11 7:34am

Do you mean, you have to write yourself the 'sorting algorithm'? If it is just an exercise, then you may code the bubble sort, it is almost trivial to implement.

Edin Kalabić 18-Feb-11 8:20am

Yes I do.

Sergey Alexandrovich Kryukov 18-Feb-11 12:02pm

Lope,

You say it's your personal exercise. So, do exercise, otherwise you will never really learn anything!
--SA

Sergey Alexandrovich Kryukov 18-Feb-11 12:03pm

We know all that, don't we?
My 5,
--SA

Edin Kalabić 18-Feb-11 16:03pm

Yes, that's ok. But I said that I'm fresh at programming so I needed a little help at the start.

Sergey Alexandrovich Kryukov 18-Feb-11 17:25pm

Nobody rants against you: this is legitimate question. Somebody even gave you a good vote.
Still, I really recommend you first read a detailed book making simplest exercise and not missing a single topic. When this important stage is passed, you will be much more ready to ask questions here and get much more benefit if the help. It will pat off well in near future. Many not very string developers keep suffering for years because they tried to run fast through this important stage.
--SA

CPallini 18-Feb-11 17:58pm

I gave the good vote. It's pointless downvoting questions like this (it's pointless downvoting questions, I think: rarely a question deserves it). :-)

Sergey Alexandrovich Kryukov 18-Feb-11 20:29pm

Sorry, who're talking to? I see two votes of "5" at the tread you're writing from...
--SA

CPallini 19-Feb-11 2:34am

I'm talking to you about the vote to the question (not to my answer). Sorry it was just my rant against questions downvoters (I rarely find a question so silly to need a low vote).

Edin Kalabić 19-Feb-11 4:19am

SAKryukov,

I have two detailed books which I learn from at college, but they don't seem very good, after reading your comments here. I found programming interesting and went a bit further with my learning than the other students and found a problem in creating this function, so I asked for help. Could you probably recommend me some literature on C++ that you think could help me more than my own ?
CPallini,
thanks for your help too, I found some texts on bubble sorting on the net, and it really helped!

Sergey Alexandrovich Kryukov 19-Feb-11 16:01pm

On C++ specifically I did not read much except Bjarne Stroustrup; good experts on C++ I know usually also recommended his books. In my opinion, this reading is not so easy for the absolute novice and is maybe too concentrated on the single language (I prefer a bit wider context with a bit of computer science overviews on most topics). Nevertheless, his books are good enough to use as a course of learning, detailed and complete with really good exercises. I can tell a word about simple exercises. Sometimes they look easy and you would skip them because you're sure you're already can solve them; and this is often happens to be a mistake: sometime you cannot because of misjudgment which will go with experience.
--SA