Crazy C language Notes (pointers)

Pointer Chapter

4. Properties of Array A

int A[3][4] = {{1,3,5,7},{9,11,13,15},{17,19,21,23}}

int data in the Keil compilation environment, accounting for 2 bytes of memory

Representation	Meaning	Address
A	Two-dimensional array name, pointing to an array a[0], which is the 0 header address	Set 2000
A[0], * (a+0), *a	0 row 0 Column element address	2000
A+1,&A[1]	1 row 0 Column element address	2008
A[1], * (a+1)	Address of 1 Rows 0 column element a[1][0]	2008
A[1]+2, * (a+1) + 2, &[1][2]	1 row 2 column (i.e. a[1][2]) element address	2012
* (a[1]+2), * (* (a+1) +2), a[1][2]	1 rows 2 columns (i.e. a[1][2]) element values	Element 13

(1) Why does * (a+1) indicate the first address of a line?

Answer: * (a+x) ==a[x]; The two are equivalent.

(2) How does the C language cause * (A+X) and a[x] to be completely equivalent?

A: In an array, *a is a[0],a+1 pointing a[1],a+2 to a[2],a+3 pointing to a[3], which means

* (a+1), * (a+2), * (A+3) respectively a[1], a[2], a[3]. In the actual code generation mechanical code relationship, two effects are completely equivalent.

Next Update Time 2014.09.12

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Crazy C language Notes (pointers)