Which of the following operations is NOT allowed on array names in C?

The correct answer is B: arr++ (incrementing). Array names are non-modifiable lvalues. You cannot use ++ on them. However, individual elements can be accessed and modified.

What will happen if malloc() fails and returns NULL but code doesn't check?

The correct answer is B: Dereferencing NULL causes undefined behavior/crash. Dereferencing a NULL pointer causes undefined behavior, typically resulting in segmentation fault or program crash.

In C, what is the difference between #include and #include "stdio.h"?

The correct answer is B: searches standard directories; "" searches current directory first. Angle brackets search standard include directories, while quotes search the current directory first, then standard directories.

What will be the output of the following code? int *ptr = malloc(sizeof(int)); if(ptr == NULL) printf("Failed"); else printf("Success");

The correct answer is B: Success. In typical scenarios, malloc() successfully allocates memory and returns non-NULL pointer, printing 'Success'. NULL check is good practice for error handling.

Which of the following demonstrates proper use of the return statement in error handling?

The correct answer is D: All of the above are valid approaches. All three approaches are valid for error handling in C. Functions typically return NULL for pointers, negative values for integers, or use predefined error codes to indicate failure states.

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C Programming

C language from basics to advanced placement prep

291 Q 10 Topics Take Mock Test

Difficulty: All Easy Medium Hard 291–291 of 291

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.291 Easy Basics & Syntax

Which of the following is the correct syntax to declare a variable in C?

A int x;

B int x

C int: x;

D declare int x;

Correct Answer: A. int x;

EXPLANATION

In C, variable declaration requires a semicolon at the end. The syntax is 'data_type variable_name;'

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