C Operators

Question 31

Write the output of the following C program

C

#include <stdio.h>

  int main (void)
  {
  int shifty;
  shifty = 0570;
  shifty = shifty >>4;
  shifty = shifty <<6;
  printf(\"the value of shifty is %o\",shifty);
  }

• the value of shifty is 15c0
• the value of shifty is 4300
• the value of shifty is 5700
• the value of shifty is 2700

Question 32

The following three \'C\' language statements is equivalent to which single statement? y=y+1; z=x+y; x=x+1

• z = x + y + 2;
• z = (x++) + (++y);
• z = (x++) + (y++);
• z = (x++) + (++y) + 1;

Question 33

Given i = 0, j = 1, k = –1 x = 0.5, y = 0.0 What is the output of the following expression in C language ? x * y < i + j || k

• -1
• 0
• 1
• 2

Question 34

Loop unrolling is a code optimization technique:

• that avoids tests at every iteration of the loop.
• that improves performance by decreasing the number of instructions in a basic block.
• that exchanges inner loops with outer loops
• that reorders operations to allow multiple computations to happen in parallel

Question 35

Output of following C++ code will be?

C++

#include <iostream>
using namespace std;

class X 
{
public:
    int x;
};

int main()
{
    X a = {10};
    X b = a;
    cout << a.x << " " << b.x;
    return 0;
}

• Compiler Error

• 10 followed by Garbage Value

• 10 10

• 10 0

Question 36

Output of following program? 

C++

#include <iostream>
using namespace std;

class Point {
    Point() { cout << "Constructor called"; }
};

int main()
{
    Point t1;
    return 0;
}

• Runtime Error

• None of these

• Constructor called

• Compiler Error

Question 37

Given that x = 7.5, j = -1.0, n = 1.0, m = 2.0 the value of - - x + j == x>n> = m is: 

• 0
  

• 1
  

• 2
  

• 3
  

Question 38

If n has 3, then the statement a[++n]=n++;

• assigns 3 to a[5]
  

• assigns 4 to a[5]
  

• assigns 4 to a[4]
  

• what is assigned is compiler dependent
  

Question 39

#include "stdio.h"

int main() 

{ 

  int x, y = 5, z = 5; 

  x = y == z; 

  printf("%d", x); 

  

  getchar(); 

  return 0; 

}

• 0
  

• 1
  

• 5
  

• Compiler Error
  

Question 40

C

#include <stdio.h>
int main()
{
    int i = 3;
    printf(\"%d\", (++i)++);
    return 0;
}

What is the output of the above program?

• 3
  

• 4
  

• 5
  

• Compile-time error