The document discusses data type conversion in C++. It explains that data type conversion can be either implicit (automatic) or explicit (user-defined). Implicit conversion occurs automatically during operations with mixed data types, changing operands to the larger type. Explicit conversion requires a cast operator to manually change a value's type. Four main cast operators are discussed: dynamic_cast, static_cast, reinterpret_cast, and const_cast.

2.  The process of converting the data type of
a value in another data type is known as
data type conversion.
 The conversion can be performed in two
ways:
 Implicit (Automatic)
 Explicit (User-defined)

3.  It convert data type to another data
type automatically.
 Implicit conversion do not required any
operator.
 The operands in arithmetic operation
must be of similar types.
 An expression in which different data
types is called Mixed-type expression.

4.  In this case, the result of an expression is
evaluated to larger data type in the
expression .
 Suppose an expression contains an
integer and double as operands.
 The result will be evaluated to double
data type.

6. Expression Intermediate Type
Char + Float Float
Int - Long Long
Int * Double Double
Float / Long Double Long Double

7.  Suppose x is an integer and y is long and
we want to add up these two variables.
x+y.
In the above data type of x is lower then
data type y. So the value of x will be
changed or converted int long during
executation.

8.  #include<iostream>
Using namespace std;
Int main()
{
Int iv=16777217;
Float fv=16777216.0;
Cout<<“The Integer value is=“<<iv;
Cout<<“The Float value is=“<<fv;
Cout<<“The Equality is=“<<iv==fv;
Return 0;
}

9. The Equality is 1.
This odd behavior is caused by an implicit
cast of iv to float when it is compared
with fv; a cast which loses precision,
making the values being compared the
same. This odd behavior is caused by an
implicit cast of iv to float when it is
compared with fv; a cast which loses
precision, making the values being
compared the same.

10. #include<iostream>
Using namespace std;
int main()
{
int x, y;
A a(10);
B b=a;
b.getXY(x,y);
cout<<"x: "<<x<<" y: "<<y<<endl
return 0;
}

11.  It can be converted or performed by the
programmer .
 It will be performed by the using of cast
operator or operators.
 Cast operator tells the computer to
convert the data type of a value.
 Syntax : (type)expression .
 Type : It indicates the data type to which
operand is to be converted.

12.  Expression : It indicates the constant,
variable or expression or whose data
type is to be converted.
 Example:
#include<iostream>
Using namespace std;
Int main() {
float a,b;
int c;
c=(int)a % (int)b;
Cout<<“Result is”<<c;
Return 0;
}

13.  In the above program two float value
are declared .
 Above Program generate an error
because of using the reminder operator
with float values.
 Reminder operator can be used with
integer values so we converted these
values in int data type.
(int)a + (int)b;

14.  Traditional explicit type casting allow to
convert any pointer into any other
pointer type, independently of type they
point to.
 Pointer : It is a simple variable which is
declared by using the asterisk sign
before the variable.

15.  There are Four Types of casting:
 dynamic_cast : It can be used only with
pointers and references to object.
 Static_cast : It can perform conversions
between pointers to related classes, not
only from the derived class to its base,
but also from a base class to its derived.

16.  reinterpret_cast : It convert any pointer
type to any other pointer type, even of
unrelated classes.
 const_cast : It minipulates the constness
of an object, either to be set or to be
moved.

17.  cout<<“The End”;