CS 100

Introduction to Computer Science

Lab 5

PERL: loops & subroutines

Due: May 1 / 2 at midnight

Task 1: Write a program to add numbers from 1 to 1000 and then output the result.

Task 2: write a program to add all the odd numbers that are in the range of 1 to 1000 and then output the result.

Task 3: Write a program for the following algorithm:

(1) Step 1: take a number from the keyboard,

(2) Step 2: if the number is great than 0, sum all the integers that are greater than 0 and less than

or equal to the given number, then output the result. If the number is less than or equal to 0,

then display the message “the number you input is not greater than 0!” to the screen and

terminate your program.

Task 4: Similar to Task 3. But you need to use a subroutine for Step 2.

How to submit your programs?

Please email your programs for the tasks to Jasper Lin by the due date. His email address is jlin@mtholyoke.edu.

Make sure you codes work correctly before you submit them.

Grading:

Task 1 (Proper use of the for loop)	10 points
Task 2 (Proper use of for loop, % operation)	10 points
Task 3 (Proper use of if – else statement)	10 points
Task 4 (Proper use of subroutines)	10 points
Overall Readability of the codes (comments, indenting of code blocks, descriptive variable names, etc.)	10 points