c++programming

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class payroll
{
    float salary;
public:
    payroll(float f)
    {
        salary=f;
    }
    void show_salary()
    {
        cout&lt;&lt;&quot;salary=&quot;&lt;&lt;salary;
    }
    payroll operator+(payroll);
};
payroll payroll::operator +(payroll p)
{
    payroll p2;
    p2.salary=salary+p.salary;
    return p2;
}
void main()
{
    payroll anil(1200),deepak(1300),acct;
    acct=anil+deepak;
    acct.show_salary();
}

getting error : no appropriate default constructor available.

Posted 17-Nov-10 12:56pm

piyush rastogi 12

Updated 17-Nov-10 13:16pm

Chris Maunder772.9K

v2

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Peter_in_2780 · Answer 1 · 2010-11-17T13:12:00

The error message tells you. You don't have a constructor payroll() with no arguments*, yet you are trying to implicitly call one at two places in your code. If you add the lines

payroll()
{
  salary = 0.0;
}

to your class (say, before the definition of operator+), then it should all work.

* A constructor with no arguments is called a default constructor.

Peter
Vote for answers, and mark accepted if appropriate.

paladin_t · Answer 2 · 2010-11-17T18:02:00

Solution 2

Peter_in_2780 is reading my mind.
And a constructor payroll() without arguments is not necessary if you code as payroll p2(salary+p.salary);. The default constructor is for statements like payroll p2;.

Posted 17-Nov-10 18:02pm

paladin_t

Stephen Hewitt · Answer 3 · 2010-11-17T18:53:00

You only have the following constructor:

payroll:payroll(float f)

This means that out of the following instantiations in your code:

payroll anil(1200),deepak(1300),acct;

only the first two are valid.

The first two are valid because of the constructor I quoted above has a float parameter.
You can either remove the last one:

payroll anil(1200), deepak(1300)

or add a default constructor:

class payroll
{
    float salary;
public:
    payroll()
    {
        salary=0.0f;
    }
    payroll(float f)
    {
        salary=f;
    }
    void show_salary()
    {
        cout<<"salary="<<salary;
    }
    payroll operator+(payroll);
};

NOTE: If you hadn't had any constructors the compiler would have added a default constructor, but since you have one it doesn't bother and you have to code it yourself.

Alain Rist · Answer 4 · 2010-11-17T20:44:00

Solution 4

Hi,
As everybody already said, you miss a constructor without parameter.

Changing to:

public:
    payroll(float f = 0.) // can be called without param
    {
        salary = f;
    }

should be enough :)
cheers,
AR

Posted 17-Nov-10 20:44pm

Alain Rist

c++programming

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