Reverse engineering involves taking something apart to see how it works.
The advantages are you can learn the kind of system functions a target program is using. You can learn the files the target program accesses. You can learn the protocols the target software uses and how it communicates with other parts of the target network. The most powerful advantage to reversing is that you can change a program's structure and thus directly affect its logical flow.
The disadvantages would be by enabling competitors to create competing devices, the possibility of reverse engineering might decrease the incentive for technology creators to develop new products, and reducing the manufacturer’s control over consumer uses for the product might have the same effect.
One tool is REC Studio 4 - Reverse Engineering Compiler some of the features are Disassembler, Disassembler, Calling conventions, Floating-point, Windows Debugger.

Short Answer
5. The variable’s name, and the variable’s data type
6. Some languages assign a default value such as 0 to uninitialized variables. In many languages, however, uninitialized variables hold unpredictable values.
Algorithm workbench review
3. set b = 2+a Set a = b * 4 Set b = a / 3.14 Set a = b – 8
4. a. Set result = x + y
b. Set result = z * 2
c. Set result = y / x
d. Set result = y – z result = x++ - y;
Answer -4 result = 4 – 8 = -4 result = ++w + y;
Answer
w = w + 1 = 5 + 1 = 6 result = 6 + 8 = 14
5. Declare Real price= 0.00
Display "the original price."
Input item original price
Display "price"
6. Declare Real price= 0.00
Display "the original price."
Input item original price
Display "price"
7. count := 27
8. /*Declare variables
Total (number (3)) = 0
A (number (2)) =10
B (number (2)) =14 begin Total=A+B end 9.