C Language Practice Questions & Assignments

1. What is the output of the following code?

printf("%d", sizeof(int));

• A.1
• B.2
• C.4
• D.Depends on compiler

2. Which operator has the highest precedence?

• A.+
• B.*
• C.()
• D.=

3. What is the default return type of a function in C?

• A.void
• B.int
• C.char
• D.float

4. Which of the following is a valid way to declare a pointer?

• A.int ptr;
• B.*int ptr;
• C.int *ptr;
• D.int ptr*;

5. What is the size of a char array needed to store "Hello"?

• A.5
• B.6
• C.7
• D.8

6. Which header file is required for printf() and scanf()?

• A.<string.h>
• B.<stdlib.h>
• C.<stdio.h>
• D.<math.h>

7. What is the value of 5 % 2?

• A.2
• B.1
• C.0
• D.2.5

8. Which loop executes at least once?

• A.for
• B.while
• C.do-while
• D.None of the above

9. What does & operator return?

• A.Value of variable
• B.Address of variable
• C.Size of variable
• D.Type of variable

10. Which function is used to find string length?

• A.strlen()
• B.strcpy()
• C.strcat()
• D.strcmp()

11. Array index in C starts from:

• A.0
• B.1
• C.-1
• D.Depends on declaration

12. What is arr[0] if arr is declared as int arr[5]?

• A.Last element
• B.First element
• C.Invalid
• D.Second element

13. Which function copies one string to another?

• A.strlen()
• B.strcpy()
• C.strcat()
• D.strcmp()

14. String in C is terminated by:

• A.' ' (space)
• B.'\n' (newline)
• C.'\0' (null)
• D.'\t' (tab)

15. What is the maximum size of an array in C?

• A.100
• B.1000
• C.Fixed at compile time
• D.Depends on memory

1. What is C programming language?

2. Explain the difference between = and == operators.

3. What is a variable? Give examples.

4. Explain printf() and scanf() functions.

5. What are format specifiers? Give examples.

6. Differentiate between if and switch statement.

7. Explain break and continue statements.

8. What is an array? How is it declared?

9. Explain string in C.

10. What is a function? List its advantages.

11. Explain call by value and call by reference.

12. What is a pointer? Why is it used?

13. Explain NULL pointer and void pointer.

14. What is structure? Give example.

15. Differentiate between structure and union.

16. Explain dynamic memory allocation.

17. What is file handling? List file operations.

18. Explain command line arguments.

19. What are preprocessor directives?

20. Explain scope and lifetime of variables.

1. What is the output of the following program?

#include <stdio.h>

int main() {
    int x = 5;
    int y = ++x + x++;
    printf("%d %d", x, y);
    return 0;
}

2. What is the output of the following program?

#include <stdio.h>

int main() {
    int arr[5] = {1, 2, 3, 4, 5};
    printf("%d", arr[5]);
    return 0;
}

3. What is the output of the following program?

#include <stdio.h>

int main() {
    int a = 10;
    int *ptr = &a;
    printf("%d %d", *ptr, a);
    return 0;
}

4. What is the output of the following program?

#include <stdio.h>

int main() {
    int i;
    for (i = 0; i < 5; i++);
    printf("%d", i);
    return 0;
}

5. What is the output of the following program?

#include <stdio.h>

int main() {
    int x = 10, y = 20;
    if (x = 20) {
        printf("True");
    } else {
        printf("False");
    }
    return 0;
}