quiz

Which is valid C expression?
a) int my_num = 100,000;
b) int my_num = 100000;
c) int my num = 1000;
d) int $my_num = 10000;

• a

• b

• c

• d

Answer explanation

Space, comma and $ cannot be used in a variable name.

Which of the following cannot be a variable name in C?
a) volatile
b) true
c) friend
d) export

• a

• b

• c

• d

Answer explanation

Volatile is C keyword.

What is short int in C programming?
a) The basic data type of C

b) Qualifier
c) Short is the qualifier and int is the basic data type
d) All of the mentioned

• a

• b

• c

• d

Functions in C Language are always _________

a) Internal
b) External
c) Both Internal and External
d) External and Internal are not valid terms for functions

• a

• b

• c

• d

What will be the output of the following C code?

1. #include <stdio.h>

2. int main()

3. {

4. int y = 10000;

5. int y = 34;

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

7. return 0;

8. }

• Compile time error

• Hello World! 34

• Hello World! 1000

• Hello World! followed by a junk value

Answer explanation

Since y is already defined, redefining it results in an error.

What will happen if the following C code is executed?

1. #include <stdio.h>

2. int main()

3. {

4. int main = 3;

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

6. return 0;

7. }

• It will cause a compile-time error

• It will cause a run-time error

• It will experience infinite looping

• It will run without any error and prints 3
  

Answer explanation

C program can have same function name and same variable name.

What will be the final value of x in the following C code?

1. #include <stdio.h>

2. void main()

3. {

4. int x = 5 * 9 / 3 + 9;

5. }

• 3.75

• Depends on compiler

• 24

• 3

Answer explanation

9/3=3

5*3=15

15+9=24

ans 24

What is the difference between the following 2 C codes?

1. Program 1

2. #include <stdio.h>

3. int main()

4. {

5. int d, a = 1, b = 2;

6. d = a++ + ++b;

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

8. }

Program 2

1. #include <stdio.h>

2. int main()

3. {

4. int d, a = 1, b = 2;

5. d = a++ +++b;

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

7. }

• No difference

• Space does make a difference, values of a, b, d are different

• Program 1 has syntax error

• Program 2 has syntax error

What is the output of the following program?

#include<stdio.h>

main()

{

printf("\");

}

• \

• \"

• ' \ '

• Compile error

Answer explanation

Compile error, Format string of printf is not terminated.

What is the output of the following program?

#include<stdio.h>

main()

{

char s[] = "Hello\0Hi";

printf("%d %d", strlen(s), sizeof(s));

}

• 5 9

• 7 20

• 5 20

• 8 20

Answer explanation

Length of the string is count of character upto ‘\0’. sizeof – reports the size of the array.