C++ Programming - Functions

#include<iostream.h>
long BixFunction(int x, int y = 5, float z = 5)
{
    return(++x * ++y + (int)++z);
}
int main()
{
    cout<< BixFunction(20, 10); 
    return 0;
}

#include<iostream.h>
int BixFunction(int a, int b = 3, int c = 3)
{
    cout<< ++a * ++b * --c ; 
    return 0;
}
int main()
{
    BixFunction(5, 0, 0); 
    return 0;
}

#include<iostream.h> 
void MyFunction(int a, int b = 40)
{
    cout<< " a = "<< a << " b = " << b << endl;
}
int main()
{
    MyFunction(20, 30);
    return 0; 
}

#include<iostream.h> 
static int b = 0; 
void DisplayData(int *x, int *y = &b)
{
    cout<< *x << " " << *y;
}
int main()
{
    int a = 10, b = 20 ;
    DisplayData(&a, &b);
    return 0; 
}

#include<iostream.h> 
typedef void(*FunPtr)(int);
int Look(int = 10, int = 20);
void Note(int); 
int main()
{
    FunPtr ptr = Note;
    (*ptr)(30); 
    return 0;
}
int Look(int x, int y)
{
    return(x + y % 20);
}
void Note(int x)
{
    cout<< Look(x) << endl;
}