Chapter 4, Problem 29.1E

Program Plan Intro

Factorial

Program plan:

• Import the necessary package.
• Create a class “Factorial1” ,
  • Define the function “main()”,
    • Declare and initialize the necessary variables.
    • Create “Scanner” object to get the user input.
    • Get the user input using “next()”.
    • Execute “while” to check whether the entered input is negative.
      • If t is a negative input, then ask the user for the next non-negative input.
    • Check whether the value of “n” is “0”,
      • Print the factorial value as “1” for “0”.
    • Otherwise, check whether the value of “” is greater than or equal to “1”,
      • If it “true”, execute the next statement inside “do”.
        • Calculate the factorial.
        • Increment the counter variable.
        • • Check the condition at the end of “do-while” statement.
          • Print the factorial value.