C/C++ Source Codes

programme to show that.a class can be derived from more than 1 base classes

//a class can be derived from more than 1 base classes
#include <iostream.h>
#include <math.h>
class vector
{
public:
double x;
double y;
vector (double a = 0, double b = 0)
{
x = a;
y = b;
}
double surface()
{
return fabs (x * y);
}
};
class number
{
public:
double z;
number (double a)
{
z = a;
}
int is_negative ()
{
if (z < 0) return 1;
else return 0;
}
};
class trivector : public vector, public number
{
public:
trivector(double a=0, double b=0, double c=0) : vector(a,b), number(c)
{
} // The trivector constructor calls the vector
// constructor, then the number constructor,
// and in this example does nothing more.
double volume()
{
return fabs (x * y * z);
}
};
void main()
{
trivector a(2, 3, -4);
cout << a.volume() << endl;
cout << a.surface() << endl;
cout << a.is_negative() << endl;
}

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