Question

What is the difference between *x=i and x=&i?

Code:

int i=2;
int *x;

*x=i; //what is the difference between this...
x=&i; //...and this??

//Also, what happens when I do these? Not really important but curious.
x=i;
*x=*i;

Answer 1

*x=i; //what is the difference between this...

This assigns the value of i to an integer stored at the address pointed to by x

x=&i; //...and this??

This assigns the address of i to x.

Note that in your example x is unassigned, so the behavior of *x=i is undefined.

Here is a better illustration:

int i = 2, j = 5;
printf("%d %d\n", i, j); // Prints 2 5
int *x = &j;
*x = i;
printf("%d %d\n", i, j); // Prints 2 2