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Understanding Sequences of Characters in Computer Science: A Guide to Strings

This introduction to computer science discusses strings as sequences of characters, exploring the manipulation of data sequences. Learn about string properties, indexing, slicing, reversing, appending, and more.

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Understanding Sequences of Characters in Computer Science: A Guide to Strings

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  1. Thinking about Strings Intro to Computer Science CS1510, Section 2 Dr. Sarah Diesburg

  2. What are strings? • Sequences of characters • We will often work with sequences of data • String is just a specific example • We will see many of the things we do with strings later on with other sequences of data

  3. Sequences of data • Can work with size of sequence • Can work with individual pieces of information in the sequence

  4. Thought Exercise • Suppose I give you a string >>> mesg = “Today is Wednesday” • What is the length of that string?

  5. Thought Exercise >>> mesg = “Today is Wednesday” • mesg[1] • mesg[11] • mesg[-1] • mesg[3:9] • mesg[15:]

  6. Note about Answers >>> msg[3:9] • Answer is ay is • But how do we write this to show spaces? • On answer sheets or tests, be very careful • If I can’t tell that there are spaces, I might take points off

  7. Questions so far?

  8. Let’s talk about the lab • Sequences, indexes, and slicing. • Reversing the Str • Working backwards and appending • Working forwards and prepending • Counting the vowels • Handling both cases • Using functions and handling only one case

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