Different types of Structure Declaration in C

Asked Oct 13 '19 at 11:12

Active Oct 13 '19 at 11:12

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I discovered that we can define structures in C in different ways, now I am a little confused with the declaration of structures.

//0th way
struct struct0;

//1st Way
struct struct1{
    int m;
};

//2nd Way
struct struct2{
    int m;
}struct2;

//3rd Way
typedef struct{
    int m;
} struct3;

//4th way
typedef struct struct4{
    int m;
} struct4;

asked Oct 13 '19 at 11:12

Adarsh Kumar

1

The first one doesn't define anything, it **declares** that a structure by that name is defined somewhere else. – Shawn Oct 13 '19 at 11:17
1

Note that your 2nd way declares a _variable_ called `struct2` of type `struct struct2`. – Mat Oct 13 '19 at 11:21
`struct struct2{ int m; }struct2;` is equivalent to `struct struct2{ int m; }; struct struct2 struct2;` – KamilCuk Oct 13 '19 at 11:22
@KamilCuk OK I get it now. – Adarsh Kumar Oct 13 '19 at 13:07

Different types of Structure Declaration in C

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