Thread: Swapping the indices of a structure

  1. #1
    Registered User
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    Swapping the indices of a structure

    I'd like to do this for my selection sort.

    I can do it for a member of a structure, e.g. if STUCT info[] is a structure and name is a string member of the structure:

    Code:
    strcpy(temp, info[a].name);
    strcpy(info[a].name, info[b].name);
    strcpy(info[b].name, temp);
    I'm trying to create a swap which causes every member of the structure for a particular index to swap it's index (not just for a specific member like in the example I provided).

    I hope that's clear.

    Thanks for any help!
    Last edited by porstart; 11-24-2010 at 04:47 PM.

  2. #2
    Gawking at stupidity
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    You mean something like:

    Code:
    struct mystruct temp;
    memcpy(&temp, &info[a], sizeof(temp));
    memcpy(&info[a], &info[b], sizeof(temp));
    memcpy(&info[b], &temp, sizeof(temp));
    ?
    If you understand what you're doing, you're not learning anything.

  3. #3
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    Quote Originally Posted by itsme86 View Post
    You mean something like:

    Code:
    struct mystruct temp;
    memcpy(&temp, &info[a], sizeof(temp));
    memcpy(&info[a], &info[b], sizeof(temp));
    memcpy(&info[b], &temp, sizeof(temp));
    ?
    I'm 90% sure memcpy isn't covered in my course.

    Basically if I have a structure which I've filled, how would I swap the 1st index with the 2nd index for every member of the structure?

    So that if I'm printing the structure's members, if it starts out like this:
    one two three //all index one
    four five six // all index two

    It will become this after sorting:
    four five six //new index one
    one two three //new index two
    Last edited by porstart; 11-24-2010 at 05:12 PM.

  4. #4
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    How about...

    Code:
    struct mystruct temp;
    temp = info[a];
    info[a] = info[b];
    info[b] = temp;

  5. #5
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    Quote Originally Posted by CommonTater View Post
    How about...

    Code:
    struct mystruct temp;
    temp = info[a];
    info[a] = info[b];
    info[b] = temp;
    Thank you. I thought I'd already tried that ;\

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