Switch statements are used to ...

• A. Evaluate a single condition and execute one block.
• B. Evaluate an expression against multiple constant cases and execute the matching block.
• C. Iterate over elements in a collection.
• D. Define a function pointer.

Answer: (B)

Switch statements map a value to one of several blocks by evaluating an expression and comparing it to constant cases. When the expression matches a case label, the code in that block runs, allowing you to define distinct actions for each possible value of the variable. This is ideal when you have a single variable that can take a known set of discrete values and you want different behavior for each value, without chaining multiple if-else checks. In many languages, you need to end each case with a break (or otherwise manage control flow) to avoid unintended fall-through, and a default block handles any values not explicitly listed. This is not about testing a single boolean condition, nor about iterating over a collection, nor about defining a function pointer.