Lecture 3: C and gdb
Preparation
Read K&R:
Chapter 2. Types, Operators, and Expressions
2.9 Bitwise Operator
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1 2 3 4 |
unsigned getbits(unsigned x, int p, int n) { return (x >> (p+1-n)) & ~(~0 << n); } |
Chapter 5. Pointers and Arrays
5.1 Pointers and Addresses
5.2 Pointers and Function Arguments
5.3 Pointers and Arrays
There is one difference between an array name and a pointer that must be kept in mind.
A pointer is a variable, so
pa = a and
pa++ are legal.
But an array name is not a variable; construction like
a = pa and
a++ are illegal.
5.4 Adress Arithmetic
The behavior is undefined for arithmetic or comparisons with pointers that do not point to members of the same array.
(There is one exception: the address of first element past the end of an array can be used in pointer arithmetic.)
5.5 Character Pointers and Functions
Chapter 6. Structures
6.4 Pointers to Structures
（以上是我阅读这几节时划了线的内容）
Handouts
gdb
介绍了下 gdb
pointers example
介绍了下指针
Lab 2: Memory management
to be continued…