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Which of the following is a correct identifier in C++?

What happens if the following program is executed in C and C++?

#include <stdio.h> 
void func(void)
{
	printf("Hello");
}
void main() 
{ 
	func();
	func(2);
}

By default, all the files in C++ are opened in _________ mode.

Which of the following is used for comments in C++?

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

#include <iostream> 
#include <string>
#include <cstring>
using namespace std; 
int main(int argc, char const *argv[])
{
	const char *a = "Hello\0World";
	cout<<a;
	return 0;
}

What happens if the following C++ statement is compiled and executed?

int *ptr = NULL;
delete ptr;

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

#include <iostream> 
#include <string>
using namespace std; 
int main(int argc, char const *argv[])
{
	char s1[6] = "Hello";
	char s2[6] = "World";
	char s3[12] = s1 + " " + s2;
	cout<<s3;
	return 0;
}

What happens if the following program is executed in C and C++?

#include <stdio.h> 
int main(void) 
{ 
	int new = 5;
	printf("%d", new); 
}

Which is more effective while calling the C++ functions?

Which of the following approach is used by C++?

What is the difference between delete and delete[] in C++?

What is virtual inheritance in C++?

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

#include<iostream>
using namespace std;
int main ()
{
   int cin;
   cin >> cin;
   cout << "cin: " << cin;
   return 0;
}

Which of the following type is provided by C++ but not C?

Which of the following is the correct syntax of including a user defined header files in C++?

Which of the following correctly declares an array in C++?

Which of the following user-defined header file extension used in c++?

Which of the following is not a type of Constructor in C++?

Which of the following C++ code will give error on compilation?

================code 1=================
#include <iostream>
using namespace std;
int main(int argc, char const *argv[])
{
	cout<<"Hello World";
	return 0;
}
========================================
================code 2=================
#include <iostream>
int main(int argc, char const *argv[])
{
	std::cout<<"Hello World";
	return 0;
}
========================================

What is C++?