Question

Is there possible to initialize a object-table of a struct in c before main? I’ve got this struct:

typedef struct customer{
    int x, y;// coordinates
    int quantity;

} customer; 

customer *table1;

int main(){

    table1 = (customer *)malloc(n * sizeof(customer));

    table1[0].quantity = 0;    table1[0].x = 0; table1[0].y = 0;  //afetiria
    table1[1].quantity = 1000; table1[1].x = 0; table1[1].y = 12; // 1st 
    table1[2].quantity = 1500; table1[2].x = 6; table1[2].y = 5;  // 2nd
    table1[3].quantity = 800;  table1[3].x = 7; table1[3].y = 15; // 3rd

    distance(1,2) //calculate the distance bet 1st and 2d object 

}   

As I wanna make a distance function I noticed that it doesn’t work ifI initialize struct inside main. Any idea about how can I initialize globally table1?

Answer 1

Here’s an example of a global initialization for your array:

customer table1[] = { { 0, 0, 0 }, 
                      { 0, 12, 1000 },
                      { 6, 5, 1500 },
                      { 7, 15, 800 } };

However, what you have shown of your code should be pretty much equivalent.