Answer : D

Explaination

Error, switch expression cant be float value

#include<iostream>

using namespace std;
main() { 
   float t = 2;
	
	switch(t) {
		case 2: cout<<Hi;
		default: cout<<"Hello";
	}
}

Answer : B

Explaination

as p holds the base address then we can access array using p just like with a

#include<iostream>

using namespace std;
main() { 
   int a[] = {1, 2}, *p = a;
   
   cout<<p[1]; 
}

Answer : B

Explaination

60 13, its swapping.

#include<iostream>

using namespace std;
main() { 
   int i = 13, j = 60;
   
   i^=j;
   j^=i;
   i^=j;
   cout<<i<<" "<<j;
}

Answer : B

Explaination

65, as the union variables share common memory for all its elements, x gets A whose ASCII value is 65 and is printed.

#include<iostream>

using namespace std;
main() {	
   union abc {
		int x;
		char ch;
	} var;
	
   var.ch = 'A';
   cout<<var.x;
}

Answer : B

Explaination

Compilation is the process of translating high level language statements into equivalent machine code, which is object code.

Answer : C

Explaination

The only permitted special symbol is under score (_) in the identifier.

Answer : D

Explaination

Two immediate forward slashes are used to comment a single line. A single can be commented by beginning with /* and should be terminated with */ , in general used for multi-line comments.

Answer : A

Explaination

As the code of inline function gets expanded at the line of call, therefore it gets executed faster with no overhead of context switch

Answer : B

Explaination

bool is the reserved keyword and cannot be used an identifier name.

Answer : B

Explaination

g++ is GNU C++ compiler for linux. Borland and vc++ (Microsoft visual c++) for windows.

Answer : C

Explaination

option (a) & (b) are valid. There is no such syntax or provision as in option (c).

Answer : D

Explaination

A function can return reference, hence it can appear on the left hand side of the assignment operator.

#include<iostream>

using namespace std;
int x = 5;

int &f() {
	return x;
}
main() {
	f() = 10;
   cout<<x;
}

Answer : C

Explaination

a.out is the default name of the executable generated on both the UNIX and Linux operating systems.

Answer : B

Explaination

As the static variable retains its value from the function calls, the recursion happens thrice.

#include<iostream>

using namespace std;
void f() {
	static int i = 3;
   
	cout<<i;
	if(--i) f();
}
main() {
	f();
}

Answer : A

Explaination

It is valid to have main() function empty, therefore producing no displayable output.

Answer : B

Explaination

In while loop 'i' gets incremented after checking for '\0', hence giving 1 more than the length.

#include<iostream>

using namespace std;
main() {
   int i;
   
   char s[] = "hello";

   for(i=0; s[i]; ++i);
      cout<<i<<endl;

   i=0;
   
   while(s[i++]);
      cout<<i;
}

Answer : C

Explaination

*a refers to 10 and adding a 1 to it gives 11.

#include<iostream>

using namespace std;
main() {	
   int a[] = {10, 20, 30};
   
	cout<<*a+1;
}

Answer : B

Explaination

*s=N, changes the character at base address to N.

#include<iostream>

using namespace std;
main() {
   char s[] = "Fine";
	*s = 'N';
   
   cout<<s<<endl;
}

Answer : D

Explaination

*s=N, trying to change the character at base address to N of a constant string leads to runtime error.

#include<iostream>

using namespace std;
main() {
   char *s = "Fine";
	*s = 'N';
   
   cout<<s<<endl;
}

Answer : B

Explaination

strcmp() is the built in function from string.h to compare two strings. Returns 0 if both are same strings. Returns -1 if first < second string. Returns 1 first > second.

Answer : B

Explaination

After s++, s points the string ++.

#include<iostream>

using namespace std;
void main() {
   char *s = "C++";
   
	cout<<s<<" ";
	s++;
	cout<<s<<" ";
}

Answer : D

Explaination

s refers to a constant address and cannot be incremented.

#include<iostream>

using namespace std;
void main() {
   char s[] = "C++";
   
	cout<<s<<" ";
	s++;
	cout<<s<<" ";
}

Answer : A

Explaination

Length of the string is count of character upto \0. sizeof reports the size of the array.

#include<iostream>
#include<string.h>

using namespace std;
main() { 
   char s[] = "Hello\0Hi";
   
   cout<<strlen(s)<<" "<<sizeof(s);
}

Answer : D

Explaination

Class member variables cannot be initialized.

#include<iostream>

using namespace std;
main() { 
   class student { 
      int rno = 10;
   } v;
  
   cout<<v.rno;
}

Answer : B

Explaination

Conditional statements are used to take alternate actions depending upon certain condition but not multi branching. C++ too provides some critical exception handlers.