DMP - Chapter 10

Arrays and Pointers

Array initialization

• automaitc, external, and static
• empty brackets

Pointers to arrays

Functions, arrays, and pointers

Pointer operations

• Assignment

  	short sdata, , *ptr_short;
  	long  ldata, *ptr_long;
  
  	ptr_short = 400;
  	ptr_long  = 400;
  
  	printf("short: %p, long: %p \n"), ptr_short, ptr_long);
  
  	*ptr_short = 124;  /* what's wrong ? */
  

• Dereferencing: *
• Taking a pointer address: &
• Listing 10.8
• Incrementing
• Differencing
• Listing 10.9

Multidimentional arrays

float rain[5][12];
int row_matrix[12][12];
static char fruit[3][2] = {'B', 'A', 'N', 'A', 'N', 'A'};
static int sq[2][3] = { {5, 6}, {7, 8} };
double 3_d[10][12][8];
short multi[3][5][100][4];

Pointers and multidimentional arrays.

• Read p. 340-3.
• Listing 10.12
• Listing 10.13

  zip[0] ==	&zip[0][0] ==	*zip
  zip[1] ==	&zip[1][0] ==	*(zip + 1)
  zip[2] ==	&zip[2][0] ==	*(zip + 2)
  zip[3] ==	&zip[3][0] ==	*(zip + 3)

• Applying the * operator to each:

  *zip[0] ==	zip[0][0] ==	**zip
  *zip[1] ==	zip[1][0] ==	**(zip + 1)
  *zip[2] ==	zip[2][0] ==	**(zip + 2)
  *zip[3] ==	zip[3][0] ==	**(zip + 3)

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