3.3.2. Designing Conditional Statements with Flags

Try these first

1. 1.

   Define the overflow flag.

   Hint

   Think about what happens when adding large negative numbers.

2. 2.

   What does the carry flag signify?

   Hint

   Consider unsigned addition.

3. 3.

   What indicates an overflow condition in signed arithmetic?

   • Carry Flag
   • Overflow Flag
   • Sign Flag

   Hint

   Remember what happens when the result exceeds the positive range.

4. 4.

   True or False: The carry flag is always relevant in signed arithmetic.

   • True
   • False

   Hint

   Consider the situations when two signed numbers of different signs are summed.

5. 5.

   Write a program that adds two 8-bit signed integers and checks for overflow. Display an appropriate message for overflow conditions.

   Hint

   Remember the rules of two's complement addition.

6. 6.

   A computer uses 4-bit arithmetic. What happens if it tries to add 8 and 1? Analyze the flags that would be set and their implications.

   Hint

   Convert the numbers into binary and simulate the addition.