📌 C Structures and Dynamic Memory Allocation Dynamic memory allocation can also be applied to structures, allowing flexible creation of objects at runtime.This is useful when the number of elements is unknown during compile...
🧹 C Deallocate Memory (free()) In C programming, dynamic memory allocation is done using functions like malloc(), calloc(), and realloc().However, this memory is not automatically released — you must manually free it using the...
✅ What is realloc()? The function realloc() is used to change the size of memory that was allocated using malloc() or calloc(). It can: Increase the memory block size Decrease the memory block size...
1. Accessing Memory Using Pointers A pointer stores the address of a variable. Use dereferencing (*) to access or modify the value at that memory address. Syntax:
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int *ptr; // pointer to int ptr = &var; // store address of var *ptr = 10; // assign value at the address |
2. Example: Pointer Access
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#include <stdio.h> int main() { int a = 50; int *ptr = &a; // pointer to a printf("Value of a: %d\n", *ptr); // access value *ptr = 100; // modify value printf("Modified a: %d\n", a); return 0; } |
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1. What is Dynamic Memory Allocation? In C, dynamic memory allocation allows programs to request memory from the heap at runtime. Unlike static memory (fixed at compile-time), dynamic memory can grow or shrink as...
1. Memory in C C programs use two main types of memory: Memory Type Description Stack Stores local variables, function calls, and automatic data. Managed automatically. Heap Stores dynamically allocated memory. Managed manually using...
1. What is an Enumeration? An enumeration (enum) is a user-defined data type in C. It consists of a set of named integer constants. Makes code more readable and less error-prone compared to using...
1. What is Struct Alignment? Alignment ensures that data members of a struct are stored at memory addresses suitable for their type. Many CPUs require certain types (like int or double) to be stored...
1. What is typedef? typedef allows you to define a new name for an existing data type. Makes code more readable, especially for complex types like structures, pointers, and function pointers. Syntax: typedef existing_type...
1. What is a Union? A union is similar to a structure (struct) in C, but all members share the same memory location. Only one member can store a value at a time. Useful...
