Question

explain with the help of an example ,the purpose of default in a switch statement.

Answer 1

The switch and case keywords evaluate expression and execute any statement associated with constant-expression whose value matches the initial expression. If there is no match with a constant expression, the statement associated with the default keyword is executed.
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Answer 2

The switch and case keywords evaluate expression and execute any statement associated with constant expression whose value matches the initial expression. If there is no match with the constant expression, the statement associated with the default keyword is executed.

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