What is the use of Struct Tag name in C programming?

Question

I want to know the actual use of struct tag_name in C programming. Without using the tag_name also i was getting output as with use of tag_name. I want the exact reason behind t

Answer 1

In the first case :

struct st1 { 
    int x; 
    char c;
} x = {100, 'a'}, y = {70, 'e'};

you declare a type with name struct st1, and you also create two objects, of this type, x and y. So you can create objects of this type whenever you want, like this :

struct st1 obj1;

However in the second case :

struct { 
    int x; 
    char c;
} x = {100, 'a'}, y = {70, 'e'};

you create a struct and two objects, x and y, but you cannot access this struct again. This means that you cannot create any new objects of this type.