Page 27 - PROGRAMMING IN C_Neat

Memory Storage - Physical View:

Pointer Expression p p+1 p+2 p+3

a[0][0] a[0][1] a[1][0] a[1][1]
10 20 30 40
Address 100 102 104 106

 Base Address  100.

Address Calculation:
Formula:

Address of a[i][j] = p + [(n*i) + j]

n – no. of columns.

 Address of a[0][1] = p + [(2*0) + 1]
= p + 1
= p + 1*ScaleFactor
= p + 1*2 (ScaleFactor for integer = 2)
= 100 + 2
= 102

Value of a[0][1] = *(p + 1)
= 20
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5. Explain array of pointers to strings with an example. ***

Array of Pointers to Strings:
Example:
static char *p[3] = {“Kandan”, “Kumaran”, “Velan”};
 Array, p has 3 pointers.
 Each pointer points to a string.
Memory Storage:

p[0] K a n d a N \0
p[1] K u m a r A n \0
p[2] V e l a n \0

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6. Explain pointers as function arguments with example. OR Explain how pointers are used as function
arguments with example. ***

Pointers as Function Arguments:
 Pointers can be used to pass addresses (references) to a function’s formal arguments.