Structure and sizeof function
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Shorthand structure with typedef keyword
To make your source code more concise, you can use typedef keyword to create a synonym for a structure. This is an example of using typedef keyword to define address structure so when you want to create an instance of it you can omit the keyword struct.
1. typedef struct{
2. unsigned int house_number;
3. char street_name[50];
4. int zip_code;
5. char country[50];
6. } address;
7. address billing_addr;
8. address shipping_addr;
Copy a structure into another structure
One of major advantage of structure is you can copy it with = operator. The syntax as follows:
1. struct_intance1 = struct_intance2
be noted that some old C compilers may not supports structure assignment so you have to assign each member variables one by one.
Structure and sizeof function
sizeof is used to get the size of any data types even with any structures. For example:
#include <stdio.h>
typedef struct __address{
int house_number;// 4 bytes
char street[50]; // 50 bytes
int zip_code; // 4 bytes
char country[20];// 20 bytes
} address;//78 bytes in total
void main()
{
// it returns 80 bytes
printf("size of address is %d bytes\n",sizeof(address));
}
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