In mathematics, the notation n! represents the factorial of the nonnegative integer n. The factorial of n is the product of all the nonnegative integers from 1 to n. For example: 7! = 1 x 2 x 3 x 4 x 5 x 6 x 7 = 5,040 Write a program that lets the user enter a nonnegative integer and then uses a loop to calculate the factorial of that number. Print the factorial to standard output. Look carefully at the following sample run of the program. In particular, notice the wording of the message and the placement of spaces and colons. Your program's output must match this. Sample Run (User input shown in bold) Enter a nonnegative integer:7 5040