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4 ways I can think of are following:
1) y = x;
2) y.a=x.a, y.b=x.b, y.c=x.c
3) memmove(&y,&x,sizeof(x));
4) memcpy(&y,&x,sizeof(x));

3 ways:
(1) y = x;
(2) y.a=x.a, y.b=x.b, y.c=x.c
(3) assuming p is a struct pointer.
p = &x;
y = *p;

What is 4th way? Could someone differentiate these alternative methods pros/cons? Thanks.

one way can be this: passing the functions as reference

write a function to copy x into y:
void copy(struct *x,struct *y)
{
*y=*x;
return(void)
}

we can also use COPY CONSTRUCTOR in struct??