What will be the output of the following program?

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

What will be the output of the following program?

#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;
}

What will be the output of the following program?

#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;
}

Which of the following function / types of function cannot have default parameters?

Where the default value of parameter have to be specified?