Explain What Are Volatile Variables?

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⟩ Explain what are volatile variables?

A volatile variable is a variable which is modified asynchronously by the threads that are concurrently running in a java application. A volatile variable does not allow having a copy of variable that is local. It is a different value from the value which is currently available in main memory. A volatile variable mandatorily have its data synchronized for all the threads. So that, whenever the value of the volatile variable is updated by any thread, all other threads can access the same value immediately. Higher access and update overhead are likely to the volatile variables on contrast to plain variables, as all threads have their own set of data for efficiency considerations.

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What is the output of this program?

 #include <iostream>
 using namespace std;
 template <class T>
 T max (T a, T b) 
 {
  return (a>b?ab);
 }
 int main () 
 {
  int i = 5, j = 6, k;
  long l = 10, m = 5, n;
  k = max(i, j);
  n = max(l, m);
  cout << k << endl;
  cout << n << endl;
  return 0;
 }
a) 6
b) 6
 10
c) 5
 10
d) 6
 5

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

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Home C++ Static Data

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