Problem programming :s

Hi everyone,

First of all, since I'm Portuguese I may do some grammatical errors, so sorry for that.

I'm programming in C a program to order a structure. This program is a work that I need to do for Numerical Analyses.

I don't know why, but it works great sometimes (with some points), but sometimes it acts backwards, instead of crescent order, it do decrescent order.

this is my function:

Code:

void ordenar_pontos (interpolacao polacao[], int pola)
{
    int ini, av;
    interpolacao temp;

    for(ini = 0;ini < pola-1; ini++)
    {
        for(av=ini+1;av < pola; av++)
        {
            if(polacao[av].x > polacao[ini].fx)
            {
                temp.x = polacao[ini].x;
                temp.fx = polacao[ini].fx;
                polacao[ini].x = polacao[av].x;
                polacao[ini].fx = polacao[av].fx;
                polacao[av].x = temp.x;
                polacao[av].fx = temp.fx;
            }
        }
    }

}

The int "pola" is the number of points in "polacao", so it goes to polacao[pola-1].

I doubt that it's meaningful to be comparing the x component of polacao[av] with the fx component of polacao[ini].

Also, to save missing struct members, or getting them mixed up.

Code:

                temp = polacao[ini];
                polacao[ini] = polacao[av];
                polacao[av] = temp;

Originally Posted by tabstop

I doubt that it's meaningful to be comparing the x component of polacao[av] with the fx component of polacao[ini].

Thank you I didn't noticed that

Originally Posted by Salem

Also, to save missing struct members, or getting them mixed up.

Code:

                temp = polacao[ini];
                polacao[ini] = polacao[av];
                polacao[av] = temp;

I didn't know that I could do that, thank you