23/3/2012 課節二

教學進度:

1. Logical operator
2. While loop (notes)
3. For loop (notes)

課後習題:

Basic questions (all students are required to do the questions below)

1. Summation
Input
An integer N. (0<N<=1000)
Output
Output the value of the expression: 1+2+3+...+n in one line.

2. Factor
Input
An integer N. (0<N<=1000)
Output
Output all the factors of N (including 1 and N) in one line.

Advanced questions (students can choose to do the following questions)

1. Perfect number

Input
An integer N. (0<N<=1000)
Output
Output "Y" if N is a perfect number. Otherwise, output "N".
A perfect number is a number that equal to the sum of its factors(excluding itself).

Try to solve the questions with the fastest way!


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