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glibware soft solutions


{ City } 503
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Answers / { glibware soft solutions }

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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Question { 1072 }

Explain RAII (Resource Acquisition Is Initialization).


Answer

• A programming idiom where resource allocation is tied to object lifetime. Destructors release resources.

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Question { 1395 }

What is the difference between inline functions and macros?


Answer

1. Macros: Text substitution; no type checking.
2. Inline functions: Replaced at runtime; provide type checking and debugging benefits.

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Question { 1395 }

What is the difference between inline functions and macros?


Answer

• Inline Functions: Type-checked, replace function calls with code during compilation.
• Macros: Preprocessor directive, no type-checking.

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Question { 1251 }

What is the difference between const and constexpr?


Answer

• const: Value remains constant; evaluated at runtime.
• constexpr: Evaluated at compile time for optimization.

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Question { 919 }

What are static variables, and where are they stored?


Answer

Static variables retain their value across multiple function calls. They are stored in the data segment of memory.

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Question { 873 }

What is a const pointer, and how does it differ from a pointer to a const?


Answer

1. Pointer to const: The value being pointed to cannot be modified, but the pointer itself can change.
Example:
2. const int a = 10;
3. const int *ptr = &a; // *ptr is read-only
4. const pointer: The pointer cannot change, but the value it points to can.

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Question { 940 }

. Explain the differences between fork() and exec() in C


Answer

1. fork(): Creates a new process (child) identical to the parent process.
2. exec(): Replaces the current process image with a new program.

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Question { 1287 }

How does the C program handle segmentation faults?


Answer

Segmentation faults occur when invalid memory is accessed. Use debugging tools like gdb to analyze.

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Question { 1069 }

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


Answer

• malloc(): Allocates memory.
• realloc(): Resizes an already allocated memory block, preserving existing data if possible.

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Question { 1234 }

Explain the concept of "dangling pointers" in C.


Answer

A dangling pointer points to memory that has been deallocated. Accessing it causes undefined behavior.

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Question { 1076 }

How do you prevent buffer overflows in C?


Answer

• Use bounds checking while working with arrays.
• Use safer functions like snprintf() instead of sprintf().

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Question { 917 }

What is the restrict keyword in C?


Answer

restrict is used with pointers to indicate that the object pointed to is accessed only through that pointer, enabling optimizations.

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Question { 920 }

Explain the difference between struct and union.


Answer

• Struct: All members occupy separate memory.
• Union: All members share the same memory.

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