Explain why the following code sample does not capture the intent of the request "Make sure if the sales code is not 'A' or 'B', the customer gets a 10% discount". What is the correct if statement?if(salesCode != 'A' || salesCode != 'B')discount = 0.10;
What will be an ideal response?
Whenever you use negatives, it is easy to make logical mistakes. The following statement will result in every customer receiving the 10% discount because every salesCode is either not 'A' or not 'B'. For example, a salesCode of 'A' is not 'B'.
if(salesCode != 'A' || salesCode != 'B')
discount = 0.10;
The statement above is always true. The correct statement is one of the following:
if(salesCode != 'A' && salesCode != 'B')
discount = 0.10;
if(!(salesCode == 'A' || salesCode == 'B'))
discount = 0.10;
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