Can the type difference between constants 32768 and 0x8000 make a difference?

Question

The Standard specifies that hexadecimal constants like 0x8000 (larger than fits in a signed integer) are unsigned (just like octal constants), whereas decimal constants like

Answer 1

On a 32 bit platform with 64 bit long, a and b in the following code will have different values:

int x = 2;
long a = x * 0x80000000; /* multiplication done in unsigned -> 0           */
long b = x * 2147483648; /* multiplication done in long     -> 0x100000000 */