Multiple Choice Questions and Answers for – Conditional Expressions in C Language

1. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         int x = 2, y = 0;

5.         int z = (y++) ? y == 1 && x : 0;

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

7.         return 0;

8.     }

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

Answer:a

2. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         int x = 1;

5.         int y =  x == 1 ? getchar(): 2;

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

7.     }

a) Compile time error
b) Whatever character getchar function returns
c) Ascii value of character getchar function returns
d) 2

Answer:c

3. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         int x = 1;

5.         short int i = 2;

6.         float f = 3;

7.         if (sizeof((x == 2) ? f : i) == sizeof(float))

8.             printf("float\n");

9.         else if (sizeof((x == 2) ? f : i) == sizeof(short int))

10.             printf("short int\n");

11.     }

a) float
b) short int
c) Undefined behaviour
d) Compile time error

Answer:a

4. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         int a = 2;

5.         int b = 0;

6.         int y = (b == 0) ? a :(a > b) ? (b = 1): a;

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

8.     }

a) Compile time error
b) 1
c) 2
d) Undefined behaviour

Answer:c

5. What is the output of this C code?

1.     #include 

2.     int main()

3.     {

4.         int y = 1, x = 0;

5.         int l = (y++, x++) ? y : x;

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

7.     }

a) 1
b) 2
c) Compile time error
d) Undefined behaviour

Answer:a

6. What is the output of this C code?

1.     #include 

2.     void main()

3.     {

4.         int k = 8;

5.         int m = 7;

6.         int z = k < m ? k++ : m++;

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

8.     }

a) 7
b) 8
c) Run time error
d) None of the mentioned

Answer:a

7. Comment on the output of this C code?

1.     #include 

2.     void main()

3.     {

4.         int k = 8;

5.         int m = 7;

6.         int z = k < m ? k = m : m++;

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

8.     }

a) Run time error
b) 7
c) 8
d) Depends on compiler

Answer:b

8. The code snippet below produces

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

9. The output of the code below is

1.     #include 

2.     void main()

3.     {

4.         int k = 8;

5.         int m = 7;

6.         k < m ? k++ : m = k;

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

8.     }

a) 7
b) 8
c) Compile time error
d) Run time error

Answer:c 

10. The output of the code below is

1.     #include 

2.     void main()

3.     {

4.         int k = 8;

5.         int m = 7;

6.         k < m ? k = k + 1 : m = m + 1;

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

8.     }

a) Compile time error
b) 9
c) 8
d) Run time error

Answer:a 

11. For initialization a = 2, c = 1 the value of a and c after this code will be
     c = (c) ? a = 0 : 2;

a) a = 0, c = 0;
b) a = 2, c = 2;
c) a = 2, c = 2;
d) a = 1, c = 2;

Answer:a 

12. What will be the data type of the expression (a < 50) ? var1 : var2;     provided a = int, var1 = double, var2 = float

a) int 

b) float 

c) double 

d) Cannot be determined

  Answer:c 

13. Which expression has to be present in the following?     exp1 ? exp2 : exp3;

a) exp1 

b) exp2 

c) exp3 

d) All of the mentioned

  Answer:d 

14. Value of c after the following expression (initializations a = 1, b = 2, c = 1):      c += (-c) ? a : b;

a) Syntax Error 

b) c = 1 

c) c = 2 

d) c = 3 

 Answer:c 

15. Comment on the following expression?     c = (n) ? a : b; can be rewritten as

a) if (!n)c = b;     else c = a; 

b) if (n <= 0)c = b;     else c = a; 

c) if (n > 0)c = a;
    else c = b;
d) All of the mentioned

Answer:a