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C/C++ Aptitude Questions and Answers



Find the output of the following program 
class complex{
            double re;
            double im;
public:
            complex() : re(1),im(0.5) {}
            bool operator==(complex &rhs);
            operator int(){}
};
 
bool complex::operator == (complex &rhs){
            if((this->re == rhs.re) && (this->im == rhs.im))
                        return true;
            else
                        return false;
}
 
int main(){
            complex  c1;
            cout<<  c1;
}
 
Answer : Garbage value
 
Explanation:
            The programmer wishes to print the complex object using output
re-direction operator, which he has not defined for his lass. But the compiler instead of giving an error sees the conversion function
and converts the user defined object to standard object and prints
some garbage value.

Find the output of the following program
class complex{
            double re;
            double im;
public:
            complex() : re(0),im(0) {}
            complex(double n) { re=n,im=n;};
            complex(int m,int n) { re=m,im=n;}
            void print() { cout<
};
 
void main(){
            complex c3;
            double i=5;
            c3 = i;
            c3.print();
}
 
Answer:
            5,5

Explanation:
            Though no operator= function taking complex, double is defined, the double on the rhs is converted into a temporary object using the single argument constructor taking double and assigned to the lvalue.

Find the output of the following program 
void main()
{
            int a, *pa, &ra;
            pa = &a;
            ra = a;
            cout <<"a="<
}
}

 
Answer :
            Compiler Error: 'ra',reference must be initialized

Explanation :
            Pointers are different from references. One of the main
differences is that the pointers can be both initialized and assigned, whereas references can only be initialized. So this code issues an error

What is a modifier?
A modifier, also called a modifying function is a member function that changes the value of at least one data member. In other words, an operation that modifies the state of an object. Modifiers are also known as Ďmutatorsí.

What is an accessor?
An accessor is a class operation that does not modify the state of an object. The accessor functions need to be declared as const operations

Differentiate between a template class and class template.
Template class:
A generic definition or a parameterized class not instantiated until the client provides the needed information. Itís jargon for plain templates.
Class template:
A class template specifies how individual classes can be constructed much like the way a class specifies how individual objects can be constructed. Itís jargon for plain classes.

When does a name clash occur?
A name clash occurs when a name is defined in more than one place. For example., two different class libraries could give two different classes the same name. If you try to use many class libraries at the same time, there is a fair chance that you will be unable to compile or link the program because of name clashes

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