Multiple Choice Questions and Answers for Assigment Operators & Expressions in C Language

1. What is the output of this C code?

1.     #include 

2.     void main()

3.     {

4.         int x = 0;

5.         if (x = 0)

6.             printf("Its zero\n");

7.         else

8.             printf("Its not zero\n");

9.     }

a) Its not zero
b) Its zero
c) Run time error
d) None

Answer:a

2. What is the output of this C code?

1.     #include 

2.     void main()

3.     {

4.         int k = 8;

5.         int x = 0 == 1 && k++;

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

7.     }

a) 0 9
b) 0 8
c) 1 8
d) 1 9

Answer:b

3. What is the output of this C code?

1.     #include 

2.     void main()

3.     {

4.         char a = 'a';

5.         int x = (a % 10)++;

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

7.     }

a) 6
b) Junk value
c) Compile time error
d) 7

Answer:c

4. What is the output of this C code?

1.     #include 

2.     void main()

3.     {

4.         1 < 2 ? return 1: return 2;

5.     }

a) returns 1
b) returns 2
c) Varies
d) Compile time error

Answer:d

5. What is the output of this C code?

1.     #include 

2.     void main()

3.     {

4.         unsigned int x = -5;

5.         printf("%d", x);

6.     }

a) Run time error
b) Aries
c) -5
d) 5

Answer:c

6. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         int x = 2, y = 1;

5.         x *= x + y;

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

7.         return 0;

8.     }

a) 5
b) 6
c) Undefined behaviour
d) Compile time error

Answer:b

7. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         int x = 2, y = 2;

5.         x /= x / y;

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

7.         return 0;

8.     }

a) 2
b) 1
c) 0.5
d) Undefined behaviour

Answer:a

8. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         int x = 1, y = 0;

5.         x &&= y;

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

7.     }

a) Compile time error
b) 1
c) 0
d) Undefined behaviour

Answer:a

9. What is the type of the below assignment expression if x is of type float, y is of type int?
     y = x + y;

a) int
b) float
c) There is no type for an assignment expression
d) double

Answer:a 

10. What is the value of the below assignment expression
     (x = foo())!= 1 considering foo() returns 2

a) 2
b) True
c) 1
d) 0

Answer:a 

11. 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

Answer:d 

12. for c = 2, value of c after c <<= 1;

a) c = 1; 

b) c = 2; 

c) c = 3; 

d) c = 4;

 Answer:d [/expand] 

13. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         int a = 1, b = 2;

5.         a += b -= a;

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

7.     }

a) 1 1
b) 1 2
c) 2 1
d) 2 2

Answer:c 

14. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         int a = 4, n, i, result = 0;

5.         scanf("%d", n);

6.         for (i = 0;i < n; i++)

7.         result += a;

8.     }

a) Addition of a and n.
b) Subtraction of a and n.
c) Multiplication of a and n.
d) Division of a and n.

Answer:c 

15. Which of the following is an invalid assignment operator?

a) a %= 10;
b) a /= 10;
c) a |= 10;
d) None of the mentioned

Answer:d