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nashi informatics solutions


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Answers / { nashi informatics solutions }

Question { 1387 }

What are the key features of C?


Answer

Simple and efficient
Portable
Procedural language
Rich set of built-in functions and operators
Low-level access to memory
Pointer support

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Question { 1387 }

What are the key features of C?


Answer

• Object-Oriented Programming: Encapsulation, Inheritance, Polymorphism.
• Memory management via pointers.
• Support for both high-level and low-level programming.
• Strong type checking.
• STL (Standard Template Library) for reusable components.

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Question { 1207 }

What is the difference between int and float?


Answer

 int: Stores integer values (e.g., 1, -10).
 float: Stores floating-point numbers (e.g., 3.14, -2.7).

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Question { 1085 }

What is the use of the #include directive?


Answer

The #include directive is used to include header files in a program. For example, #include includes the standard input-output library.

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Question { 1472 }

What are the different types of storage classes in C?


Answer

 Auto: Default storage class for local variables.
 Static: Retains variable value between function calls.
 Extern: Refers to global variables used in other files.
 Register: Suggests storing variables in the CPU register.

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Question { 1094 }

What is the difference between a structure and a union?


Answer

 Structure: All members have their own memory location.
 Union: All members share the same memory location.

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Question { 970 }

How can you dynamically allocate memory in C?


Answer

Memory can be dynamically allocated using functions like malloc(), calloc(), realloc(), and freed using free().

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Question { 804 }

What are macros in C?


Answer

Macros are preprocessor directives defined using #define to create constants or functions.

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Question { 864 }

What is a segmentation fault?


Answer

It occurs when a program attempts to access an invalid memory location.

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Question { 1011 }

What is the use of the sizeof operator?


Answer

The sizeof operator determines the size of a data type or variable in bytes.

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Question { 901 }

Explain the difference between fopen() and freopen().


Answer

 fopen(): Opens a new file.
 freopen(): Reopens a file stream to a different file or mode.

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Question { 850 }

What is the difference between calloc() and realloc()?


Answer

calloc() allocates memory and initializes it to zero.
realloc() resizes previously allocated memory.

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Question { 715 }

Explain #pragma in C.


Answer

A compiler-specific directive used for special purposes like disabling warnings.

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Question { 712 }

What are dangling pointers?


Answer

Pointers pointing to memory that has been deallocated.

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Question { 747 }

What is undefined behavior?


Answer

A program behavior that is not defined by the C standard, e.g., dividing by zero.

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