1. Problem Statement
Perform FACTORIAL !
2. Requirements
2.1 Assumptions
User will only input integers
User will only input into the command line
2.2 Specifications
User will input integer to take factorial! of
Program will print factorial!
Decomposition Diagram
Program
Input
User inputs integer
Process
FACTORIAL!
Output
Answer
Test Strategy
Valid Data
Invalid Data
Test Plan Version 1
Test Strategy
#
Description
Input
Expected Output
Actual Output
Pass/Fail
Valid Data
1
Valid Factorial
Valid Data
2
Valid Factorial
Invalid Data
1
Invalid Factorial
Invalid Data
2
Stack Overflow
Initial Algorithm
Create Function
Name: factorial
Parameters: integer input, bool methodStatus
Return: integer answer
Method:
Set methodStatus to true
If input is less than 0
Set methodStatus to false
Return -1
Else If input equals 0
Return 1
Else
Return Input * factorial(input - 1, methodStatus)
Create Main
Delcare methodStatus as false
Declare integer input as 0
Prompt user for input
Set input
Perform Factorial with input
Test Plan Version 2
Test Strategy
#
Description
Input
Expected Output
Actual Output
Pass/Fail
Valid Data
1
Valid Factorial
5
120
Valid Data
2
Valid Factorial
0
1
Invalid Data
1
Invalid Factorial
-1
-1
Invalid Data
2
Stack Overflow
Stack Overflow
9. Updated Algorithm
Create Function
Name: factorial
Parameters: integer input, bool methodStatus
Return: integer answer
Method:
Set methodStatus to true
If input is less than 0
Set methodStatus to false
Return -1
Else If input equals 0
Return 1
Else
Return Input * factorial(input - 1, methodStatus)
Create Main
Delcare methodStatus as false
Declare integer input as 0
Prompt user for input
Set input
Perform Factorial with input
Test Plan Version 3
Test Strategy
#
Description
Input
Expected Output
Actual Output
Pass/Fail
Valid Data
1
Valid Factorial
5
120
120
Pass
Valid Data
2
Valid Factorial
0
1
1
Pass
Invalid Data
1
Invalid Factorial
-1
-1
-1
Pass
Invalid Data
2
Stack Overflow
50000
Stack Overflow
Stack Overflow
Pass
12.
Error Log
Error Type (Logic/Runtime)
Cause of Error
Solution to Error
N/A
N/A
N/A
13.
Status
Broke it as needed. Other than that, success!
