Multiple Choice Questions and Answers for Relational & Logical Operators in C Language

These questions can be attempted by anyone focusing on learning C Programming language. They can be a beginner, fresher, engineering graduate or an experienced IT professional. Our C Interview questions come with detailed explanation of the answers which helps in better understanding of C concepts.

Here is a listing of C interview questions on “Relational & Logical Operators” along with answers, explanations and/or solutions:

1. What is the output of this C code?

1.     #include 

2.     void main()

3.     {

4.         int x = 1, y = 0, z = 5;

5.         int a = x && y || z++;

6.         printf("%d", z);

7.     }

a) 6
b) 5
c) 0
d) Varies

Answer:a

2. What is the output of this C code?

1.     #include 

2.     void main()

3.     {

4.         int x = 1, y = 0, z = 5;

5.         int a = x && y && z++;

6.         printf("%d", z);

7.     }

a) 6
b) 5
c) 0
d) Varies

Answer:b

3. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         int x = 1, y = 0, z = 3;

5.         x > y ? printf("%d", z) : return z;

6.     }

a) 3
b) 1
c) Compile time error
d) Run time error

Answer:c

4. What is the output of this C code?

1.     #include 

2.     void main()

3.     {

4.         int x = 1, z = 3;

5.         int y = x << 3;

6.         printf(" %d\n", y);

7.     }

a) -2147483648
b) -1
c) Run time error
d) 8

Answer:d

5. What is the output of this C code?

1.     #include 

2.     void main()

3.     {

4.         int x = 0, y = 2, z = 3;

5.         int a = x & y | z;

6.         printf("%d", a);

7.     }

a) 3
b) 0
c) 2
d) Run time error

Answer:a

6. What is the final value of j in the below code?

1.     #include 

2.     int main()

3.     {

4.         int i = 0, j = 0;

5.         if (i && (j = i + 10))

6.             //do something

7.             ;

8.     }

a) 0
b) 10
c) Depends on the compiler
d) Depends on language standard

Answer:a

7. What is the final value of j in the below code?

1.     #include 

2.     int main()

3.     {

4.         int i = 10, j = 0;

5.         if (i || (j = i + 10))

6.             //do something

7.             ;

8.     }

a) 0
b) 20
c) Compile time error
d) Depends on language standard

Answer:a

8. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         int i = 1;

5.         if (i++ && (i == 1))

6.             printf("Yes\n");

7.         else

8.             printf("No\n");

9.     }

a) Yes
b) No
c) Depends on the compiler
d) Depends on the standard

Answer:b

9. What is the output of this C code?

1.     #include 

2.     void main()

3.     {

4.         int a = 3;

5.         int b = ++a + a++ + --a;

6.         printf("Value of b is %d", b);

7.     }

a) Value of x is 12
b) Value of x is 13
c) Value of x is 10
d) Undefined behaviour

Answer:d 

10. The precedence of arithmetic operators is (from highest to lowest)

a) %, *, /, +, –
b) %, +, /, *, –
c) +, -, %, *, /
d) %, +, -, *, /

Answer:a 

11. Which of the following is not an arithmetic operation?

a) a *= 10;
b) a /= 10;
c) a != 10;
d) a %= 10;

Answer:c 

12. Which of the following data type will throw an error on modulus operation(%)?

a) char
b) short
c) int
d) float

Answer:d 

13. Which among the following are the fundamental arithmetic operators, ie, performing the desired operation can be done using that operator only?

a) +, –
b) +, -, %
c) +, -, *, /
d) +, -, *, /, %

Answer:a 

14. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         int a = 10;

5.         double b = 5.6;

6.         int c;

7.         c = a + b;

8.         printf("%d", c);

9.     }

a) 15
b) 16
c) 15.6
d) 10

Answer:a 

15. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         int a = 10, b = 5, c = 5;

5.         int d;

6.         d = a == (b + c);

7.         printf("%d", d);

8.     }

a) Syntax error
b) 1
c) 10
d) 5

Answer: b