Add Mixed Numeric Types with auto

Write a function template addMixed(T first, U second) with two type parameters and an auto return type. It returns first + second.

With auto, the compiler takes the return type from the addition itself: int + int is an int, int + double is a double and double + int is a double, so a decimal result is never cut off. The tests print addMixed(2, 3), addMixed(2, 0.5) and addMixed(1.25, 4) on separate lines. Work out the deduced return type of each call before you run it.

Do NOT write a main function.