pointers questions

A pointer in C is a variable that stores the memory address of another variable. Using pointers, we can directly manipulate memory. For example, 'int *p' declares a pointer 'p' to an integer. Pointers are useful for dynamic memory allocation and efficient array handling. 
 
int a = 10;
int *p = &a;
printf("Value: %d", *p);

Function pointers in C store the address of a function. They are used to pass functions as arguments, return functions from other functions, or call functions dynamically. A function pointer is declared like this: 'void (*fptr)()', where fptr is a pointer to a function that takes no arguments and returns void. 
 
void func() { printf("Hello"); }
void (*fptr)() = func;
fptr();