How can the elements in an associative container be efficiently accessed?

Which of the following #pragma warn directives is not valid?

What is the output of the following C code?

#include <stdio.h>

int main()

{

float a = 10;

printf("%.3f\n", a);

}

What should be the output?

int main() {

    int new = -10;

    cout<<"new is: "<<new;

    return 0;

}

what is the output ?

#include<iostream>

using namespace std;

int main()

{

int a=5,b=6;

a= a++ + ++b;

b=++a + ++b;

cout<<a<<" "<<b;

return 0;

}

What will be the output of the following C code?

#include enum abekus { a, b = 99, c, d = -1 }; main() { enum abekus m; printf("%d\n%d\n%d\n%d\n", a, b, c, d); }

 What does the following piece of code do? 

public void func(Tree root)
{
System.out.println(root.data());
func(root.left());
func(root.right());
}

In C language, when you pass an array as an argument to a function, what is actually passed?

What will be the output of the following C++ code?

#include<iostream>
#include<iterator>
#include<vector>
using namespace std;
int main()
{
vector<int> ar = { 1, 2, 3, 4, 5 };
vector<int>::iterator ptr = ar.begin();
advance(ptr, 2);
cout << *ptr << endl;
return 0;
}

What will be the output of the following C++ code?

#include <iostream>
using namespace std;
class A{
public:
A(){
cout<<"Constructor called\n";
  }
~A(){
cout<<"Destructor called\n";
   }
};
int main(int argc, char const *argv[])
{
A *a = new A[5];
delete[] a;
return 0;
}