Write a program that calculates a factorial. Ask the user to enter a number and the output

will be the factorial of that number. Recall the formula for factorial is

$x(x)*(x-1)*(x-2)dots$

Calculate the factorial of

$($a$)5$

$($b$)7$

$($c$)10$

Solution: $($a$)120($b$)5040($c$)3628800$

Note: DO NOT use the built$-$in factorial function that MATLAB has.