Operators and Enums in C Language - Quiz

What is the output of this C code? 

    int main()
    {
        int a = 4, n, i, result = 0;
        scanf("%d", n);
        for (i = 0;i < n; i++)
        result += a;
    }

  • A Addition of a and n.
  • B Subtraction of a and n.
  • C Multiplication of a and n.
  • D Division of a and n.

What is the output of this C code? 
    void main()
    {
        int x = 1, y = 0, z = 5;
        int a = x && y && z++;
        printf("%d", z);
    }

  • A 6
  • B 5
  • C 0
  • D Varies

What is the output of this C code? 

#include<stdio.h> 
void main()
 {
	int a = 5;
	int b = ++a + a++ + --a;
	printf("Value of b is %d", b);
 }

  • A Value of x is 15
  • B Value of x is 16
  • C Undefined behaviour
  • D Value of x is 21

Left shifting a number by 1 is always equivalent to multiplying it by 2.
  • A True
  • B False
  • C Don't Know
  • D Error

Which of the following Bitwise operators can be used efficiently to swap two numbers?
  • A &
  • B ^
  • C |
  • D ||

What will be the output of the program? 

#include<stdio.h>

int main()
{
    printf("%d >> %d %d >> %d\n", 4 >> 1, 8 >> 1);
    return 0;
}

  • A 4 1 8 1
  • B 4 >> 1 8 >> 1
  • C 2 >> 4 Garbage value >> Garbage value
  • D 2 4

What is the output of this C code? 

#include <stdio.h>
void main()
    {
        int x = 0;
        if (x = 0)
            printf("It's zero\n");
        else
            printf("It's not zero\n");
    }

  • A It's not zero
  • B It's zero
  • C Run time error
  • D None

What is the output of this C code? 

#include <stdio.h>
 void main()
    {
        char a = 'a';
        int x = (a % 10)++;
        printf("%d\n", x);
    }

  • A 6
  • B Junk value
  • C Compile time error
  • D 7

Operation "a = a * b + a" can also be written as:
  • A a *= b + 1;
  • B (c = a * b)!=(a = c + a);
  • C a = (b + 1)* a;
  • D All of the mentioned

Consider the following program fragment, and choose the correct one 

#include<stdio.h> 
void main()
{
   int a, b = 2, c;
   a = 2 * (b++);
   c = 2 * (++b);
   printf("a=%d, c=%d",a,c);
 
}

  • A a = 4, c = 8
  • B a = 3, c = 8
  • C b = 3, c = 6
  • D a = 4, c = 6