Assume you are performing 2s complement arithmetic in a comp

Assume you are performing 2\'s complement arithmetic in a computer with 8-bit registers. After the following code is run,

signed char a = -12, b = 125, c;

c = a - b;

the binary value of c would be _________ and the decimal value of c would be _______ when printed out.

Assume you are performing 2\'s complement arithmetic in a computer with 8-bit registers. After the following code is run,

signed char a = 119, b = 123, c;

c = a + b;

the binary value of c would be _______ and the decimal value of c would be ________ when printed out.

Solution

1)   10001100 ( -12 IN BINARY) - 01111101 ( 125 IN BINARY)

= 10001100 + 10000010 (NEGATE)

= 00001110 ( Since output can be in 8 digits only .. others will be discarded)

= + 14 (decimal)

2) 119+123

01110111 + 01111011

011110010 ( Binary)

242 (decimal)

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