Выберите безошибочный код:

double i; int j; short k; i = j = k = 0;
sbyte x, y = 100; x = 90; x = x + y;
float f = 90.7f; double d = 70.10; f=f + d;
ushort u = 10; ushort s = ++u;
byte a = 0x1a, b = 2; a += b;
char a = 'a', b = 'b' ; char c = a + b;
uint u = 1; int i = 1; long l = u * i;