Problem 3 Write a complete C++ program that does the following;

1. It asks the user to enter an even positive integer.

2. The program reads a value n entered by the user. If the value is not legal, the program repeatedly makes the user type in another value until a legal value of n has been entered.

3. The program prints an n n pattern of symbols in the shape of a large letter U.

Example, if the user enters 6 for n the program should print the following picture.

* *

* *

* *

* *

* *

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