Strings

The content covered in this chapter is aligned with the following CSTA Standard

● 1B-AP – 08 Algorithms

This chapter is divided into the following lab sessions

1. Strings I

2. Strings II

3. Strings III

4. Strings IV

5. Project – My Profile

1. Strings I

Objectives

In this session, students will learn about -

● What are Strings

■ Length of String

■ Empty String

Keywords

● Strings: Are values put inside double quotes (“ ”) in the text block. These values can be words, numbers, symbols, characters, or a combination of all these.

● Length of String: Is a function that gives the length of the input String as the result

● Empty String: Gives a true or false output depending on whether the String is empty or not

WEBS at a Glance

Recall the concepts covered in the previous coding session

Play the video given in the panel to introduce the concepts to be covered in this session

● Instruct: Go to the Panel and open the Lab on Strings I.

● Play the video given in the panel.

● Discuss the Quiz questions given in the Panel.

● Invite answers from as many students as possible.

● Conduct the activity Let’s learn String basics given in the Panel:

■ Say: Let’s see how we can add our name and find its length.

■ Instruct: Click on the Assignment section.

■ Instruct: Click the Go to Practice button to attempt the activity.

■ Walk around in the classroom and observe the activity done by the students.

■ Instruct: Click on the Yes button to submit the activity.

Note

● If time permits, conduct the additional activity given in the panel.

● Ask the following probing questions:

■ What can you store in a string? Give a few examples of strings. Possible Responses: Names; Places or Addresses; A sentence; Numbers; Special characters. Examples – “Newt”; “I love coding”; “Hello, Koi”; “123”; “Hi!”.

■ Do you think we can perform addition and subtraction in strings?

Possible Responses: No, we cannot perform general mathematical operations in strings. Addition of strings is possible though. It adds or joins two strings together.

● Assign the following project as homework:

■ Compare and check if two strings are equal or not.

Note

● The project is optional. Assign it if feasible.