Marc Chee
879 views • Streamed live on Oct 12, 2020
Key moments
What are we covering today? Pointers recap Debugging • What's a bug? • How do we find them and remove them? Characters
What are we covering today? Pointers recap Debugging • What's a bug? • How do we find them and remove them? Characters
12:05
Recap - Pointers and Memory What is a pointer? • It's a variable that stores the address of another variable of a specific type • We call them pointers because knowing something's address allows you to "point" at it Why pointers? • They allow us to pass around the address of a variable instead of the variable itself
Recap - Pointers and Memory What is a pointer? • It's a variable that stores the address of another variable of a specific type • We call them pointers because knowing something's address allows you to "point" at it Why pointers? • They allow us to pass around the address of a variable instead of the variable itself
14:59
Pointers in Functions We'll often use pointers as input to functions • Pointers give a function access to a variable that's in memory • They also allow us to affect multiple variables instead of only having one output
Pointers in Functions We'll often use pointers as input to functions • Pointers give a function access to a variable that's in memory • They also allow us to affect multiple variables instead of only having one output
26:52
Pointers and Arrays These are very similar • Arrays are sections of memory that contain multiple identical variables • The variable of the array itself stores the memory address of the start of the array • Pointers are also memory addresses • This gives both pointers and arrays access to memory
Pointers and Arrays These are very similar • Arrays are sections of memory that contain multiple identical variables • The variable of the array itself stores the memory address of the start of the array • Pointers are also memory addresses • This gives both pointers and arrays access to memory
28:04
Debugging It's going to take up most of your time as a programmer! • What is a bug? • Different types of bugs • How to find bugs
Debugging It's going to take up most of your time as a programmer! • What is a bug? • Different types of bugs • How to find bugs
29:02
What is a Software Bug? Errors in code are called "bugs" • Something we have written for not written in our code . Any kind of error that stops the program from running as intended Two most common types of bugs • Syntax Errors • Logical Errors
What is a Software Bug? Errors in code are called "bugs" • Something we have written for not written in our code . Any kind of error that stops the program from running as intended Two most common types of bugs • Syntax Errors • Logical Errors
34:07
Syntax Errors C is a specific language with its own grammar • Syntax - the precise use of a language within its rules • Cis much more specific than most human languages • Slight mistakes in the characters we use can result in different behaviour • Some syntax errors are obvious and your compiler will find them • Some are more devious and the error message will be the consequence
Syntax Errors C is a specific language with its own grammar • Syntax - the precise use of a language within its rules • Cis much more specific than most human languages • Slight mistakes in the characters we use can result in different behaviour • Some syntax errors are obvious and your compiler will find them • Some are more devious and the error message will be the consequence
35:19
Logical Errors We can write a functional program that still doesn't solved • Logical errors can be syntactically correct . But the program might not do what we intended!
Logical Errors We can write a functional program that still doesn't solved • Logical errors can be syntactically correct . But the program might not do what we intended!
38:01
Transcript
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Marc Chee
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