C Operators

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Question 1

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 2

Output of following C code will be?

C 
#include <stdio.h>
int main()
{
   int a = 0;
   int b;
   a = (a == (a == 1));
   printf("%d", a);
   return 0;
}

  • 0

  • 1

  • Big negative number

  • -1

Question 3

Output of following C code will be?

C 
#include <stdio.h>
#include <stdlib.h>

int top = 0;

char fun1()
{
    char a[] = {'a', 'b', 'c', '(', 'd'};
    return a[top++];
}

int main()
{
    char b[10];
    char ch2;
    int i = 0;
    
    while ((ch2 = fun1()) != '(')
    {
        b[i++] = ch2;
    }
    
    b[i] = '\0'; // Add null-terminating character to mark the end of the string
    
    printf("%s", b);
    
    return 0;
}

  • abc(

  • abc

  • 3 special characters with ASCII value 1

  • Empty String

Question 4

In the context of modulo operation (i.e. remainder on division) for floating point (say 2.1 and 1.1), pick the best statement.

  • For floating point, modulo operation isn't defined and that's why modulo can't be found.

  • (2.1 % 1.1) is the result of modulo operation.

  • fmod(2.1,1.1) is the result of module operation.

  • ((int)2.1) % ((int)1.1) is the result of modulo operation.

Question 5

For a given integer, which of the following operators can be used to “set” and “reset” a particular bit respectively?
  • | and &
  • && and ||
  • & and |
  • || and &&

Question 6

Suppose a, b, c and d are int variables. For ternary operator in C ( ? : ), pick the best statement.
  • a>b ? : ; is valid statement i.e. 2nd and 3rd operands can be empty and they are implicitly replaced with non-zero value at run-time.
  • a>b ? c=10 : d=10; is valid statement. Based on the value of a and b, either c or d gets assigned the value of 10.
  • a>b ? (c=10,d=20) : (c=20,d=10); is valid statement. Based on the value of a and b, either c=10,d=20 gets executed or c=20,d=10 gets executed.
  • All of the above are valid statements for ternary operator.

Question 7

The below program would give compile error because comma has been used after foo(). Instead, semi-colon should be used i.e. the way it has been used after bar(). That's why if we use semi-colon after foo(), the program would compile and run successfully while printing "GeeksQuiz"

C 
#include <stdio.h>

void foo(void)
{
 printf("Geeks");
}
void bar(void)
{
 printf("Quiz");
}

int main()
{
 foo(), bar();
 return 0;
}

  • TRUE

  • FALSE

Question 8

What does the following program do when the input is unsigned 16-bit integer?

C 
#include 
main( )
{
unsigned int num;
int i;
scanf (“%u”, &num);
for ( i = 0; i<16; i++)
{
printf (“%d”, (num << i & 1 << 15 ) ? 1:0);
}
}


  • It prints all even bits from num

  • It prints all odd bits from num

  • It prints binary equivalent of num

  • None of the above

Question 9

Which of the following operators cannot be overloaded in C/C++ ?
  • Bitwise right shift assignment
  • Address of
  • Indirection
  • Structure reference

Question 10

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

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