位填充（C）

Question

I have this code: (assuming short ints are 16 bits wide, and ints are 32 bits wide)

short int x = -5;
int y;
y = x;

Does padding on the left with the sign bit to increase precision change the value of a negative number?

Answer 1

Does padding (sign-extension) on the left with the sign bit to increase precision change the value of a negative number?

Taking into acount @Amin Negm-Awad , when a variable is assigned from one type to another, and the value is representable in both types, like -5 as in int or short , there is no value nor precision change.

This applies if a type is int , short , char , float , etc. It also applies if integer types are 2's complement or not. The size of the type makes no difference. Endian makes no difference, The value is preserved.