What Is Static Class Data?

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Home C++ Static Data

⟩ What is static class data?

Static data members of a class are declared by preceding the member variable’s declaration with the keyword static. Only one copy of static data members exist and all objects of the class share that variable. Unlike regular data members, individual copies of a static member variable are not made for each object. How many ever no of objects of a class are created, only one copy of static data member is shared amongst all of them. All static variables are initialized to zero before the first object is created.

When a member variable is declared static within a class, it is not defined (ie storage is not allocated for it) We must provide a global definition for it outside the class. This is done by redeclaring the static variable using scope resolution operator (‘::’) to identify the class it belongs to. This causes storage for the class to be allocated.

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What is the output of this program?

 #include <iostream>
 using namespace std;
 template <class type>
 class Test
 {
  public
  Test()
  {
  };
  ~Test()
  { 
  };
  type Funct1(type Var1)
  {
  return Var1;
  }
  type Funct2(type Var2)
  {
  return Var2;
  }
 };
 int main()
 {
  Test<int> Var1;
  Test<double> Var2;
  cout << Var1.Funct1(200);
  cout << Var2.Funct2(3.123);
  return 0;
 }
a) 100
b) 200
c) 3.123
d) 200 3.123

Can you please explain the difference between a template class and class template?

What is meant by template parameter?
a) It can be used to pass a type as argument
b) It can be used to evaluate a type.
c) It can of no return type
d) None of the mentioned

Which parameter is legal for non-type template?
a) pointer to member
b) object
c) class
d) none of the mentioned

Why we use  template-template parameter?
a) binding
b) rebinding
c) both a & b
d) none of these

What is the output of this program?

 #include <iostream>
 using namespace std;
 template <typename T, int count>
 void loopIt(T x)
 {
  T val[count];
  for(int ii = 0; ii < count; ii++)
  {
  val[ii] = x++;
  cout << val[ii] << endl;
  }
 };
 int main()
 {
  float xx = 2.1;
  loopIt<float, 3>(xx);
 }
a) 2.1
b) 3.1
c) 4.1
d) 2.1
 3.1
 4.1

Is the size of character literals different in C and C++?
a) Implementation defined
b) Can't say
c) Yes, they are different
d) No, they are not different

What is the output of this program?

 #include <stdio.h>
 int main()
 {
  char a = '12';
 
  printf("%d", a);
  return 0;
 }
a) Compiler error
b) 12
c) 10
d) Empty

Suppose in a hypothetical machine, the size of char is 32 bits. What would sizeof(char) return?
a) 4
b) 1
c) Implementation dependent
d) Machine dependent

How do we represent a wide character of the form wchar_t?
a) L'a'
b) l'a'
c) L[a]
d) la

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