Question

CMPE 263-SPRING 2019-HW-3

Hint. For all the codes required, run them in the Basic Computer Simulator with two print screens, one shows code, registers, memory involved before run, and the second after run. Without them, the mark will reduce to ½.

Q1.Write a program loop using a pointer and a counter that get the negative of the contents of memory locations 300through 30F.

Answer 1

Program to add two 128 bit data:-

class Add
{
public static void main (String args[])
{
Add operator + (const Add & rhs)
{
int High;
int Low,
Add Sum;
sum.High = High + rhs.High;
sum.Low = Low + rhs.Low;

// now check for overflow of low 64 bits and add a carry to high
if (sum.Low < Low)
++Sum.High;
return Sum;
}
Add operator-(const Add & rhs)
{
Add diff;
diff.High= High- rhs.High;
diff.Low = Low - rhs.Low;
// now check for underflow condition of low 64 bits and subtract carry to high
if (diff.Low> Low)
--diff.High;
return diff;
}

private:
INT64 High;
UINT64 Low;
};