[prog] strcutures containing structures...

[Tim King]

sena emre <senaemre at yahoo.com> wrote:

>   struct box{
>     int w;
>     int h; 
>     int d;
>   }:
>    
>   struct solution{
>     int no;
>     int quality;
>     struct box Cargo[10];
>   }
>    
>   solution B[20];
>    
>   for(int bc=0; bc<20; bc++)
>      for(int f=0; f<10; f++)
>          B[bc].Cargo[f].w = 10;
>   

Hi, Sena. Yes, this should work correctly. Except that "w," "h," and "d" 
should be "width," "height," and "depth." Likewise, "no," is the number 
number of solution ("solution_num") or is it the number of cargoes in 
the solution ("num_cargoes")? And "bc" and "f"... I dunno what they 
stand for.

(BTW, this is C++, not C. I can tell because you declare your loop 
variables inside the for-statement. You can't do that in C. ;-) )

So... Given these data structures, here is the kind of code I would 
probably use to initialize them. I don't know how much a beginner you 
are, so if this goes over your head, please forgive me. But I think you 
can still get the gist of it.

    struct box_t {
        int width;
        int height;
        int depth;
    };

    extern const size_t NUM_CARGOES_PER_SOLUTION;

    struct solution_t {
        int num_cargoes;
        int quality;
        box_t cargos[10];
    }

And then...

    const size_t NUM_CARGOES_PER_SOLUTION = 10;
    const size_t NUM_SOLUTIONS = 20;
    solution_t solutions[NUM_SOLUTIONS];

    void init_solutions(void) {
        for (int idx_solution = 0; idx_solution < NUM_SOLUTIONS; ++ 
idx_solution) {
            solution_t& solution = solutions[idx_solution];
            solution.num_cargoes = 0;
            solution.quality = 0;
            for (int idx_cargo = 0; idx_cargo < 
NUM_CARGOES_PER_SOLUTION; ++ idx_cargo) {
                 box_t box = solution.cargoes[idx_cargo];
                 box.width = box.height = box.depth = 0;
            }
        }
    }

Hope this helps,
-TimK

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