C Arrays, Strings, More Pointers
[Pages:47]C Arrays, Strings, More Pointers
Instructor: Jenny Song
Review of Last Lecture
? C Basics
?Variables, Functions, Control Flow, Syntax. ?Only 0 and NULL evaluate to FALSE
? Pointers hold addresses
?Address vs. Value ?Allow for efficient code, but prone to errors
? C functions "pass by value"
?Passing pointers circumvents this
6/26/2020
CS61C su20 - Lecture 3
2
Struct Clarification
? Structure definition:
? Creates a variable type "struct foo", then declare the
variable of that type
struct foo { /* fields */
};
struct foo name1; struct foo *name2;
? Joint struct definition and typedef
? Don't need to name struct in this case
struct foo {
/* fields */
};
typedef struct foo bar;
bar name1;
6/26/2020
CS61C su20 - Lecture 3
typedef struct foo { /* fields */
} bar; bar name1;
3
Great Idea #1: Levels of
Representation/Interpretation
Higher-Level Language Program (e.g. C)
Compiler
Assembly Language Program (e.g. RISCV)
Assembler Machine Language Program (RISCV)
Machine Interpretation
temp = v[k]; v[k] = v[k+1]; v[k+1] = temp;
We are here_
lw x5, 0(x2) lw x6, 4(x2) sw x6, 0(x2) sw x5, 4(x2)
0000 1001 1100 0110 1010 1111 0101 1000 1010 1111 0101 1000 0000 1001 1100 0110 1100 0110 1010 1111 0101 1000 0000 1001 0101 1000 0000 1001 1100 0110 1010 1111
Hardware Architecture Description (e.g. block diagrams)
Architecture Implementation
Logic Circuit Description (Circuit Schematic Diagrams)
6/26/2020
CS61C su20 - Lecture 3
4
Agenda
? C Operators ? Arrays ? Strings ? More Pointers
?Pointer Arithmetic ?Pointer Misc
6/26/2019
CS61C su20 - Lecture 3
5
Operator Precedence
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CS61C su20 - Lecture 3
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Assignment and Equality
? One of the most common errors for beginning
C programmers
a = b is assignment a == b is equality test
6/26/2020
CS61C su20 - Lecture 3
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Operator Precedence
For precedence/order of execution, see Table 2-1 on p. 53 of K&R
? Use parentheses to manipulate
? Equality test (==) binds more tightly than logic
(&, |, &&, ||)
?x&1==0 means x&(1==0) instead of (x&1)==0
6/26/2020
CS61C su20 - Lecture 3
8
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