Operators and Expressions in C – MCQ

1. Which of the following is a valid expression in C?
   1. int basic_pay = 23000;
   2. int basic_pay = 23,000;
   3. int basic pay = 23000;
   4. int $basic_pay = 23000;

2. Which of the following arithmetic operator takes only integer operands?
   1. +
   2. –
   3. /
   4. %

6. What will be the output for the following C code?
   1. 2
   2. 1
   3. 3
   4. Compile-time error

#include <stdio.h>
int main()
{
    int n = 8;
    n = n / 3;
    printf("%d", n);
    return 0;
}

2

7. What is the correct order of precedence of arithmetic operators from highest to lowest?
   1. %, *, /, +, –
   2. -, +, *, /, %
   3. %, +, -, *, /
   4. +, – , %, *, /

8. What will be the output for the following C code?
   1. Value of x is 3
   2. Value of x is 2
   3. Value of x is 1
   4. Compile-time error

#include <stdio.h>
void main()
{
    int y = 4;
    int x = 9 % 2 * 4 / 2;
    printf("Value of x is %d", x);
}

Value of x is 2

9. Which of the following is not an arithmetic operation?
   1. a*=5;
   2. a/=5;
   3. a!=5;
   4. a%=5;

10. What will be the output for the following C code?
    1. 10.6
    2. 10
    3. 11
    4. 16

#include <stdio.h>
int main()
{
    int a = 8;
    double b = 2.6;
    int c;
    c = a + b;
    printf("%d", c);
}

10

11. What is the result of a logical or relational expression in C?
    1. 0 or 1
    2. True or false
    3. 0 if false and a positive number if true.
    4. T or F

12. What will be the output for the following C code?
    1. 23
    2. 15
    3. Undefined behavior
    4. 21

 #include <stdio.h>
 int main()
 {
    int x = 5, y = 2;
    x *= x - y;
    printf("%d", x);
    return 0;
}

15

13. What will be the output for the following C code?
    1. 4
    2. 2
    3. 1
    4. Undefined behavior

#include <stdio.h>
int main()
{
    int x = 4, y = 2;
    x /= x / y;
    printf("%d\n", x);
    return 0;
}

2

14. What will be the output for the following C code?
    1. Compile-time error
    2. Yes
    3. No
    4. Nothing

#include <stdio.h>
void main()
{
    int x = 0;
    if (x = 0)
        printf("Yes");
    else
        printf("No");
}

No

15. What is the use of sizeof() operator?
    1. To get the size of data types or variables in bytes
    2. To get the size of variables only
    3. To get the size of the structure only
    4. None of the above

16. What is the operator ‘:?’ called?
    1. If-Else operator
    2. Ternary operator
    3. Logical operator
    4. Comparison operator

17. Which of the following are true regardless of the implementation?
    1. sizeof(int) is not less than sizeof(long)
    2. sizeof(int) equals sizeof(unsigned)
    3. sizeof(double) is not less than sizeof(float)
    4. Both B and C

18. If y is of integer type then the expressions3 * ( y -8 ) / 9and(y - 8) /9 * 3
    1. must yield the same value
    2. must yield different values
    3. may or may not yield the same value
    4. none of the above

19. Integer division results in
    1. truncation
    2. rounding
    3. overflow
    4. none of the above

20. In an expression involving ||operator, evaluation
    1. will be stopped if one of its components evaluates to false
    2. will be stopped if one of its components evaluates to true
    3. takes place from left to right
    4. Both B and C

21. Implicit type conversion takes place
    1. across an assignment operator.
    2. if an operator has operands of different data types.
    3. Both A and B
    4. None of the above.

22. Choose the correct statements
    1. Casting refers to implicit type conversion
    2. Coercion refers to implicit type conversion
    3. Casting refers to explicit type conversion
    4. Both B and C

23. Pick the operators that associate from the left
    1. +
    2. ,
    3. ==
    4. All of above

24. Pick the operators that associate from the right
    1. ?:
    2. +=
    3. =
    4. All of above

25. Pick the operators whose meaning is context-dependent.
    1. *
    2. #
    3. &
    4. All of above

26. x -= y + 1;means
    1. x = x – y + 1
    2. x = -x – y – 1
    3. x = -x + y + 1
    4. x = x – y – 1

27. Which of the following comments about the ++ operator are correct?
    1. It is a unary operator
    2. The operand can come before or after the operator
    3. It cannot be applied to an expression
    4. All of above

29. If a=5 and b=2 then printf("%d", a+++b); will?
    1. results in a syntax error
    2. print 8
    3. print 10
    4. None of the above

30. The statement printf("%d", (a++)); will print
    1. the current value of a
    2. the value of a + 1
    3. an error message
    4. garbage

31. The statement printf("%d", ++5); will print
    1. 5
    2. 6
    3. an error message
    4. garbage

32. The statement printf("%d", sizeof("")); will print
    1. 0
    2. 1
    3. an error message
    4. garbage value

33. The ascending order of precedence of the bit-wise operators &, ^, and | is
    1. & ^ |
    2. ^ & |
    3. | ^ &
    4. & | ^