JuniorTheoryCommon

What happens when this program is compiled and run?

var phones = new Dictionary<string, int>();
phones["Ann"] = 101;
phones["Bob"] = 102;
Console.WriteLine(phones["Ann"]);
Console.WriteLine(phones["ann"]);

101, then a KeyNotFoundException

Expecting 101 0: reading a missing key through the indexer throws a KeyNotFoundException; it does not give the default 0.
Expecting ann to find Ann: string keys are compared case-sensitively, so the dictionary has no key ann.

How would you read the value so that a missing key gives 0 instead of an exception?
What happens if the program then calls phones.Add("Ann", 199)?

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JuniorTheoryCommon

What happens when this program is compiled and run?

var phones = new Dictionary<string, int>();
phones["Ann"] = 101;
phones["Bob"] = 102;
Console.WriteLine(phones["Ann"]);
Console.WriteLine(phones["ann"]);

101, then a KeyNotFoundException

Expecting 101 0: reading a missing key through the indexer throws a KeyNotFoundException; it does not give the default 0.
Expecting ann to find Ann: string keys are compared case-sensitively, so the dictionary has no key ann.

How would you read the value so that a missing key gives 0 instead of an exception?
What happens if the program then calls phones.Add("Ann", 199)?

Back to questions Open topic in roadmap →Answer it yourself — Quiz