CODEWITHSUNDEEP
pointersstructurecopying
Nithin Ramesan
Nithin Ramesan

Reputation: 1

How do I copy structures using pointers to structures?

I need to copy one instance of a structure to another, using the respective structure pointers. The code I have tried is as follows:

typedef struct{
int a, b, c;} test;

int main(){
test *q, *w;
(*w).a = 2;
(*w).b = 3;
(*w).c = 4;

printf("\n%d\n%d\n%d", (*w).a, (*w).b, (*w).c);

memcpy((void*)q, (void*)w, sizeof(test));

printf("\n%d\n%d\n%d", (*q).a, (*q).b, (*q).c);

return 0;

The output I get is:

2
3
4
1875984
32768
1296528

Can someone please tell me how to copy the structure? I need to use pointers to structures, simply doing:

test w, q;
q = w;

will not suffice for my program.

Thanks.

Upvotes: 0

Views: 44

Answers (1)

TryinHard
TryinHard

Reputation: 4118

Replace the line in your code:

memcpy((void*)q, (void*)w, sizeof(test));

with the following line:

memcpy((void*)&q, (void*)&w, sizeof(test));

Upvotes: 2

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