Logical shift and arithematic shift

[sunidrak]

If we do 1bit logical left shift in a 8 bit register then the

new value=2 times the old value
suppose the Old value is 10000010 (130 in decimal)
then the New value 00000100 (4 in decimal)
then the statement left shift will produce 2 times the old value will not be true

can anybody plz explain how it hold true ??
If we do 2bit left shift then the new value will be 4 times the old one ?? Wat is relation ??

 

[alexan_e]

The statement holds true as long as you don't exceed the given bit length max value (255 for 8 bit), if you exceed it then you get a truncated result , the same as if you try to do it using

uin8_byte = 130 * 2;

If you try it with a 16bit data type then it will work fine in both cases.