Which of the following operator is overloaded for object cout?

#include<stdio.h>

int main()

{

        float a=3.5;

        printf("%f %f",a,a);

}

Which of the following functions must use a reference parameter?

#include<stdio.h>

int main()

{

int a=10,b=15;

printf("=%d",(a+1),(b=a+2));

printf(" %d=",b);

return 0;

}

Which of the following concepts means waiting until runtime to determine which function to call?

#include<iostream> 

using namespace std; 

void swap (int& first, int& second) 

{ 

int temp = first; 

first = second; 

second = temp; 

} 

int main() 

{ 

int a = 2, b = 3; 

swap( a, b ); 

cout << a << b; 

return 0; 

} 

Declare a pointer to a function that accepts three pointers to integer quantities as arguments and returns a pointer to a floating-point quantity.

How can you print "Hello World" without using a semicolon?

What will be the output?

#include <stdio.h>

int main()

{

   char * _ptr = NULL; 

   _ptr = malloc(0);

   if(_ptr==NULL) printf("_ptr is NULL");

   else printf("_ptr not NULL");

   printf(" %p ", _ptr);

   *_ptr = '@';

   printf(" %c ", *_ptr);

   free(_ptr);

   return 0;

}