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”.

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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”.

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