Chapter 1: Communicating with Your Computer
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Introduction to programming with JavaScript, Chapter 1. Video version: https://www.youtube.com/watch?v=Ps03yn2XlUw In this chapter, we explore the basics of computer programming through hands on exercises with JavaScripts. Concepts covered: - expressions - statements - values - operators
Chapter 1: Communicating with Your Computer
- 1. chapter 1 communicating with your computer
- 3. We talk to computers with programming languages. c++
- 4. JavaScript
- 8. input output
- 9. input output JavaScript Code text, behavior
- 10. what is 2 + 2? 4!
- 11. 2 + 2;
- 13. 2 + 2; expression semicolon ends the expression
- 14. 2 + 2; expression semicolon ends the expression arithmetic operator
- 15. 2 + 2; expression semicolon ends the expression arithmetic operator value value
- 16. 2 + 2; evaluates to the value 4
- 17. var sum = 2 + 2;
- 18. var sum = 2 + 2; expression assignment operator identifier keyword to declare new variable
- 20. var sum = 2 + 2; sum = 4 + 10; // sum now equals 14
- 21. var sum = 2 + 2; sum = 4 + 10; // sum now equals 14 comment, ignored by the JavaScript engine
- 22. var sum = 2 + 2; sum = 4 + 10; // sum now equals 14 sum + 10; // evaluates to 24
- 23. var sum = 2 + 2; sum = 4 + 10; // sum now equals 14 sum = sum + 10; // sum equals 24
- 24. 10 - 6; // evaluates to 4 10 * 4; // evaluates to 40 10 / 2; // evaluates to 5
- 25. 10 - 6; // evaluates to 4 10 * 4; // evaluates to 40 10 / 2; // evaluates to 5 subtraction operator multiplication operator division operator
- 26. Review
- 27. What are the values in this expression? 1 + 45 + 10 + 20;
- 28. What does this expression evaluate to? 99 + 1 + 10;
- 29. What does this expression evaluate to? // 34 + 5 + 1;
- 30. What value is the variable bottles set to? var cans = 2 + 10; var bottles = 2 + cans - 10 - cans;
- 31. Homework #1 Write a JavaScript expression which adds 5 to 10. This expression should evaluate to 15. Use www.repl.it to write your code.
- 32. Homework #2 Define three variables. One should hold your age, one should hold your favorite number, and one should hold the number of siblings you have. Next, define a new variable which stores the result of adding the previous three variables together.
- 33. Homework #3 Define a variable to hold the number of hours in a day. Multiply this value by 7 to get the number of hours in a week. Assign this to a new variable. Next, multiply this by the number of weeks in a year (52) and assign the result of this in a new variable. Finally, divide this number by the number of days in a year (365). What is the result?
- 34. Intro to Programming with Seth McLaughlin