Exercises

Checkpoint 23.16.1.

Write a templated function doubleIt with one parameter that doubles the value by adding it to itself and returns the answer.

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For example: doubleIt(3.5) should produce 7.0 doubleIt("hello") should produce "hellohello"

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Checkpoint 23.16.2.

Write a templated function sumList that will take in a vector of the template type. It should sum up all the elements using + then return the total.

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Hint.

Use T sum{}; to default initialize a sum variable of any type.

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Checkpoint 23.16.3.

Write a templated function countMatches that will take in a vector of the template type and a value of the same type. It should return the number of elements in the vector that match the given value.

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Hint.

Your return type won’t be T, it will always be an integer.

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Checkpoint 23.16.4.

Make a templated struct ItemCounter. An item counter should store item, a value of the templated type, and an int count, representing the number of that item. For instance, an ItemCounter<string> could store the string "apple" and the number 3.

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Hint.

Your return type won’t be T, it will always be an integer.

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