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nashi informatics solutions


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Answers / { nashi informatics solutions }

Question { 675 }

What is the use of the restrict keyword?


Answer

Used to optimize pointers by guaranteeing no overlap with other pointers.

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Question { 769 }

What is an lvalue and an rvalue?


Answer

lvalue: A location in memory that can appear on the left-hand side of an assignment.
rvalue: The value assigned to an lvalue.

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Question { 935 }

Can a program have multiple main() functions?


Answer

No, only one main() function is allowed.

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Question { 827 }

What is the output of printf("%d", printf("Hello"));?


Answer

Output:
Hello5

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Question { 725 }

Why is C called a middle-level language?


Answer

It combines features of high-level and low-level languages.

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Question { 847 }

What is the difference between void main() and int main()?


Answer

void main() is not standard; int main() is required by the C standard to return an integer.

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Question { 738 }

What are static functions?


Answer

Functions declared with static have internal linkage, accessible only within the file.

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Question { 729 }

How to avoid buffer overflow?


Answer

Use bounds-checking functions like fgets() instead of unsafe functions like gets().

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Question { 775 }

What are function pointers? Provide an example.


Answer

Pointers to functions that allow dynamic invocation of functions. Example:
void (*funPtr)(int) = &printNumber;

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Question { 760 }

Explain command-line arguments in C.


Answer

Command-line arguments are passed to the main() function as argc (argument count) and argv (argument vector).

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Question { 1015 }

What is the difference between a shallow copy and a deep copy?


Answer

• Shallow Copy: Copies memory addresses. Changes in one object affect the other.
• Deep Copy: Creates a new copy of the actual data, independent of the original.

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Question { 957 }

Explain virtual functions in C++.


Answer

• A virtual function is a member function that can be overridden in derived classes. Declared with the virtual keyword in the base class, enabling runtime polymorphism.

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Question { 968 }

Explain the concept of inheritance in C++.


Answer

Inheritance allows one class (derived class) to acquire the properties and methods of another class (base class). Types: single, multiple, multilevel, hierarchical, hybrid.

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Question { 998 }

What are access specifiers in C++?


Answer

• Private: Members are accessible only within the class.
• Protected: Accessible within the class and derived classes.
• Public: Accessible from outside the class.

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Question { 1007 }

What is the use of the this pointer?


Answer

• It points to the calling object and is used to resolve scope issues, especially with member functions

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