Inheritance implementation of c ++ standard exception classes

The source is Baidu. Querying and learning

// Abnomaltest. cpp: defines the console applicationProgram.
# Include "stdafx. H"
# Include <iostream>
Using namespace STD;
Class triangle: Public exception // class that defines a triangle
{
Public:
Float a, B, c, d;
Float S;
Public:
Triangle ()
{}
Triangle (float A1, float B1, float C1)
{
A = A1;
B = b1;
C = C1;
}
Void judgment () Throw (exception) // you can check whether a triangle exists.
{
If (a + B) <c | (A + C) <B | (C + B) <A) // any side and smaller than the third side are not triangles
{
Throw exception ("not a triangle ");
}
}
Void dimension () // calculated area
{
D = (A + B + C)/2; // Helen Formula
S = SQRT (D * (d-a) * (D-B) * (D-C ));
}
};
Void _ tmain ()
{
Triangle A (7,2, 3 );

try
{< br>. judgment ();
. dimension ();
cout <"area of Triangle A:" <. S }< br> catch (exception & E)
{< br> wcout }< BR >}