CODEWITHSUNDEEP
cstructinitialization
Jose Ramon
Jose Ramon

Reputation: 5386

Initialization of a struct

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?

Upvotes: 1

Views: 654

Answers (2)

prelic
prelic

Reputation: 4518

You can move the malloc call outside main, but that should make no difference. As long as table1 is declared outside of main, which it is in your example, it should be visible to the entire translation unit.

Upvotes: 0

Carl Norum
Carl Norum

Reputation: 225172

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.

Upvotes: 3

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