$1.$ Write a C$++$ program that does the following:

a$.$ Create a C$++$ file with the name problem$3.$cpp$.$

b$.$ Prompt the user for a positive integer, validating the input until the user enters a positive integer.

c$.$ Print all the factors of the positive integer.

d$.$ Number x is a factor of number y$,$ when the remainder of y divided by x is $0.$

Sample run of the program:

Enter a positive integer: $71$

Invalid input! Try again: $42$

The factors of $42$ are: $12367142142$

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