Question

11) var1 byte 148
or var1,26h
Show the hexadecimal digits in var1:
12) mov eax -1
WHAT IS THE HEX IN EAX
13) Multiply 10011b x 10110b in binary

Answer 1

(148)₁₀=10010100 (convert to binary. ) First convert to hex, find the remainder, 148%16=4

divide by 16 148/16=9 find the remainder 9%16 = 9

divide by 16 9/16 =0 so stop. hex is reveser order of remainders.

148 = 94h =10010100₂ Write the 4 digit binary of each hexa digit 9->1001 4->0100

26h =00100110 Write the 4 digit binary of each hexa digit. 2->0010 6->0110

10010100 (OR) 0 or 0 =0, 0 or 1=1, 1 or 0 =1, 1 or 1=1

00100110

-------------------------

10110110 = 1011 0110 =B6h

var1=B6h

(12) mov eax,-1

eax=FFFFFFFF

-1 will be stored in 2's complent form

2's complment = 1's complement  of 1 + 1

1=00000000000000000000000000000001 (32 bit)

1'scomplement= 11111111111111111111111111111110 (obtained by inverting 0 to 1 and 1 to 0)

2's compl=1'comp+1=11111111111111111111111111111110+1=11111111111111111111111111111111

=FFFFFFFF₁₆

₍₃₎  
10011×101101001101001100100110000110100010

          10011

        ×10110

----------------------------------------------

          00000        

        100110

      1001100

    00000000

100110000

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110100010