- **fileName**: pointer-memoryAdress
- **Created on**: 2024-06-12 13:23:59

** In C, each time you run your program, the operating system assigns different memory addresses to variables due to a concept called Address Space Layout Randomization (ASLR). ASLR is a security feature that randomizes the memory addresses used by a program each time it is executed, making it harder for malicious programs to predict the locations of specific variables or functions, which enhances security by mitigating certain types of attacks.**

Why Variables Are Stored in Different Memory Locations

1. ASLR (Address Space Layout Randomization): This security feature causes the memory addresses assigned to variables to change each time the program is executed.
2. Stack Layout: The variables age, age2, age3, age4, and age5 are stored on the stack. Each time the program runs, the stack may start at a different location in memory.
3. Memory Management by OS: The operating system's memory manager dynamically allocates stack and heap memory. This can result in different memory addresses for the same variables across different runs.

Memory Clean-up After Program Execution

When a program terminates, the operating system reclaims all the memory that was allocated to it. This means:

• Stack Memory: All stack memory (which includes local variables like age, age2, etc.) is automatically cleaned up by the OS when the program exits.
• Heap Memory: If your program allocates heap memory (using malloc, calloc, etc.), this memory is also reclaimed by the OS when the program terminates. However, it's still a good practice to free heap memory explicitly in your program to avoid memory leaks during the program's runtime.
• Global and Static Memory: These are also cleaned up by the OS when the program exits.

for accessing the memory address in c:

int myAge = 43;     // Variable declaration  
int* ptr = &myAge;  // Pointer declaration  
  
// Reference: Output the memory address of myAge with the pointer (0x7ffe5367e044)  
printf("%p\n", &myAge);  
  
// Dereference: Output the value of myAge with the pointer (43)  
printf("%d\n", *ptr);

for accessing the value for pointer:

int* ptr = &myAge;  
printf("%d", *ptr)

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before:rand-time.md