& C

Question

What does & mean in C???

Answer 1

In C, & is a unary operator that gives the memory address of a variable expression. If you have a varable,

int x = 50;

you can use &x to determine where in memory x is located.

int *ptr;
ptr = &x;

Now ptr holds the memory address of x where the value 50 is stored.

Of course we can use x to print 50. And now we can use ptr to print 50, too, if we dereference the pointer address by using *ptr:

printf("%d %d\n", x, *ptr);

// prints 50 50

Answer 2

& is for address which can be stored in a pointer variable.
int *ptr;
ptr=&a;
so address of a as in this case.
We can also use && but for a different purpose:)