Page 241 - DCAP404 _Object Oriented Programming
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Object-oriented Programming
Notes The following program example demonstrates the declaration and use of pointer in C++.
Example:
# include<iostream.h >
int main( )
{
int i = 18, * p_age;
p_age = &I;
cout<<i<< “ << * p_age << endl;
}
Did u know? Why Member function pointers are important?
Member function pointers are important because they provide an efficient way to cache
the outcome of a decision over which member function to call.
11.2.1 Accessing Address of Variable
Consider the following statements:
int q, * i, n;
q = 35;
i = & q;
n = * i;
i is a pointer to an integer containing the address of q. In the fourth statement we have assigned
the value at address contained in i to another variable n. Thus, indirectly we have accessed the
variable q through n using pointer variable i.
11.2.2 Pointer Expressions
Like other variables, pointer variables can be used in expressions. Arithmetic and comparison
operations can be performed on the pointers.
Example: If p1 and p2 are properly declared and initialized pointers, then following
statements are valid.
y = * p1 * *p2;
sum = sum + * p1;
11.2.3 Pointer Initialization
When declaring pointers we may want to explicitly specify which variable we want them to
point to:
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