memory address

[logistic_guy]

here is the question

What memory address ($\displaystyle 0$ through $\displaystyle 256$) is represented by each of the following hexadecimal numbers?

(a) $\displaystyle 0C_{16}$
(b) $\displaystyle 5E_{16}$
(c) $\displaystyle DF_{16}$


my attemb
hexadecimal number don't use digits after $\displaystyle 9$, it use letters from $\displaystyle A$ to $\displaystyle F$
$\displaystyle A = 10$
$\displaystyle B = 11$
$\displaystyle C = 12$
$\displaystyle D = 13$
$\displaystyle E = 14$
$\displaystyle F = 15$

so

$\displaystyle 0C_{16} = 0 + 12 = 12$
$\displaystyle 5E_{16} = 5 + 14 = 19$
$\displaystyle DF_{16} = 13 + 15 = 28$

is my solution correct?

 

[BeansNRice]

Come on... does 75 = 7+5?

You are looking for 16 times the first digit plus the 2nd digit just like base ten is 10 times the first digit plus the 2nd digit (in a 2 digit base ten number)

 

[logistic_guy]

thank

Come on... does 75 = 7+5?

it depend on what you're calculating. is $\displaystyle 75$ base $\displaystyle 8$, $\displaystyle 10$, or something else?

You are looking for 16 times the first digit plus the 2nd digit just like base ten is 10 times the first digit plus the 2nd digit (in a 2 digit base ten number)

you're saying my calculating should be

$\displaystyle 0C_{16} = 0\times 16 + 12 = 12$
$\displaystyle 5E_{16} = 5\times 16 + 14 = 80 + 14 = 94$
$\displaystyle DF_{16} = 13\times 16 + 15 = 208 + 15 = 223$

i don't understand why you multiply the first digit by $\displaystyle 16$ why not the second digit?

 

[BeansNRice]

thank


it depend on what you're calculating. is $\displaystyle 75$ base $\displaystyle 8$, $\displaystyle 10$, or something else?


you're saying my calculating should be

$\displaystyle 0C_{16} = 0\times 16 + 12 = 12$
$\displaystyle 5E_{16} = 5\times 16 + 14 = 80 + 14 = 94$
$\displaystyle DF_{16} = 13\times 16 + 15 = 208 + 15 = 223$

i don't understand why you multiply the first digit by $\displaystyle 16$ why not the second digit?

Work a few problems in base 10 and then see if you can figure out what I told you w/regard to base 16.