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Interview Questions

Q.1 What is C?

C is a procedural programming language developed at Bell Labs in 1972.

Q.2 Explain the difference between malloc() and calloc() functions.

malloc() allocates a specified number of bytes of memory, while calloc() allocates a specified number of blocks of memory, each initialized to zero.

Q.3 What is a pointer in C?

A pointer is a variable that stores the memory address of another variable.

Q.4 What is the use of the sizeof operator in C?

The sizeof operator returns the size, in bytes, of a data type or an object.

Q.5 Explain the difference between ++i and i++ in C.

Both increment the value of i, but ++i increments the value before the operation, while i++ increments it after the operation.

Q.6 What is the purpose of the static keyword in C?

The static keyword is used to declare static variables and functions, limiting their scope to the file they are declared in.

Q.7 What is the difference between NULL and 0 in C?

In C, NULL is typically used for pointers, while 0 is used for integers.

Q.8 Explain the role of the #define preprocessor directive.

#define is used to create macros, allowing the definition of constants or simple functions.

Q.9 What is the difference between const and volatile qualifiers in C?

const indicates that a variable\\\'s value cannot be changed, while volatile indicates that a variable can be changed at any time without any action being taken by the code the compiler finds nearby.

Q.10 What is a structure in C?

A structure is a user-defined data type that groups related data members under a single name.

Q.11 What is the purpose of the sizeof operator in C?

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Q.12 Explain the concept of dynamic memory allocation in C.

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Q.13 What is the purpose of the const keyword in C?

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Q.14 Explain the difference between strcmp() and stricmp() functions in C.

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Q.15 What is a function pointer in C?

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Q.16 Explain the role of the volatile keyword in C.

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Q.17 What is the purpose of the break statement in C?

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Q.18 Explain the use of the continue statement in C.

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Q.19 What is a union in C?

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Q.20 Explain the purpose of the typedef keyword in C.

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Q.21 What is the role of the register keyword in C?

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Q.22 Explain the concept of bitwise operators in C.

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Q.23 What is the purpose of the goto statement in C?

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Q.24 Explain the use of the #include preprocessor directive in C.

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Q.25 What is a file pointer in C?

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Q.26 Explain the concept of recursion in C.

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Q.27 What is the difference between signed and unsigned data types in C?

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Q.28 Explain the purpose of the const pointer in C.

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Q.29 What is a macro in C?

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Q.30 Explain the concept of a structure padding in C.

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Q.31 What is the role of the sizeof operator in C?

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Q.32 Explain the difference between continue and break statements in C.

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Q.33 What is a bit field in C?

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Q.34 Explain the concept of a header file in C.

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Q.35 What is the role of the volatile keyword in C?

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Q.36 Explain the difference between #define and const in C.

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Q.37 What is the purpose of the extern keyword in C?

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Q.38 Explain the concept of a linked list in C.

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Q.39 What is the difference between printf and sprintf functions in C?

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Q.40 Explain the concept of a static function in C.

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Q.41 What is the purpose of the return statement in C?

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Q.42 Explain the use of the enum keyword in C.

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Q.43 What is a double pointer in C?

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Q.44 Explain the concept of file handling in C.

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Q.45 What is the role of the static keyword in function declaration in C?

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Q.46 Explain the concept of an infinite loop in C.

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Q.47 What is the purpose of the const pointer in C?

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Q.48 Explain the use of the do-while loop in C.

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Q.49 What is the purpose of the break statement in C?

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Q.50 Explain the difference between a local variable and a global variable in C.

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