Chapter 6, Problem 18.1E

Program Plan Intro

Perfect number

Program Plan:

• Import required packages.
• Declare the class “PerfectNumber”.
• Define the main method.
  • Traverse the “for” loop to get the perfect number.
    • Call the method “isPerfect()”.
    • Check whether “res” is not equal to “null”.
      • Print the result.
  • Definition of method “isPerfect()”.
    • Assign the “factor” value to “1”.
    • Assign the “fac” to “1”.
    • Check the condition using “for loop.
      • Check whether the “num” mod “i” equals to “0”.
        • Assign the factors with the value of “i”.
        • • Check whether the “factor” equals to “num”.
            • Return the “factors”.
            • Return “null”.