Homework Answers
Answer :
a. Area code test :
Above flowchart can be used to determine whether the given area code is valid or not.
Test Cases :
Following are Valid area codes :
1. Null
2. 123
3. 111
Following are Invalid area codes :
1. a12
2. 1#2
3. 3#a
4. abc#
b. Prefix code test :
Above flowchart can be used to determine whether the given prefix code is valid or not.
Test Cases :
Following are Valid prefix codes :
1. 234
2. 223
3. 222
Following are Invalid prefix codes :
1. 023
2. 123
3. 23a
4. #34
5. a#5
c. Postfix code test :
Above flowchart can be used to determine whether the given postfix code is valid or not.
Test Cases :
Following are Valid postfix codes :
1. 1234
2. 1123
3. 1112
4. 1111
5.1231
Following are Invalid postfix codes :
1. a123
2. 1#23
3. a#24
4. aaaa
5. a#a#
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