A function needs to modify a variable in the calling function. Which parameter passing method is appropriate?

The correct answer is B: Pass by reference using pointers. To modify a variable in the calling function, you must pass its address (pointer). Pass by value creates a copy and cannot modify the original.

What is the purpose of defined() operator in preprocessor conditionals?

The correct answer is A: To check if a macro is defined. defined(MACRO) is used in #if and #elif directives to test if a macro is defined. Example: #if defined(DEBUG) ... #endif. It's equivalent to #ifdef but can be used in expressions with logical operators like && and ||.

Which header file must be included to use malloc(), calloc(), and free() functions?

The correct answer is B: #include . All memory allocation and deallocation functions are declared in .

Which of the following statements about switch case is TRUE?

The correct answer is C: Multiple cases can execute if break is missing (fall-through). Without break, execution falls through to the next case. Default can be anywhere, and modern C allows switch with other types.

What is the output of: float x = 5/2; printf("%f", x);

The correct answer is B: 2.0. 5/2 is integer division (not float division), so result is 2 (integer), then converted to 2.0 (float).

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C Programming
File Handling

C language from basics to advanced placement prep

52 Q 10 Topics Take Mock Test

Difficulty: All Easy Medium Hard 51–52 of 52

Topics in C Programming

All Basics & Syntax 86 Data Types & Variables 97 Control Flow 100 Functions 99 Arrays & Strings 100 Pointers 99 Structures & Unions 100 File Handling 100 Dynamic Memory 98 Preprocessor 99

Q.51 Medium File Handling

Which function writes formatted data to a file?

A fprintf()

B fwrite()

C fputs()

D fputc()

Correct Answer: A. fprintf()

EXPLANATION

fprintf() writes formatted data to a file, similar to printf() but with a file pointer as the first argument.

Test

Q.52 Medium File Handling

What does fgets() function do?

A Reads a line from a file

B Gets file status

C Gets file size

D Gets file pointer position

Correct Answer: A. Reads a line from a file

EXPLANATION

fgets() reads a string from a file until a newline character or end of file is encountered. It takes three arguments: buffer, size, and file pointer.

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C Programming File Handling

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File Handling