C

pointers to a function in c

#include <stdio.h>
#include <string.h>

void (*StartSd)(); // function pointer
void (*StopSd)();  // function pointer

void space()
{
    printf("
");
}

void StopSound() // funtion
{
    printf("
Sound has Stopped");
}

void StartSound() // function
{
    printf("
Sound has Started");
}

void main()
{

    StartSd = StartSound; // Assign pointer to function
    StopSd = StopSound;   // Assign pointer to function

    (*StartSd)(); // Call the function with the pointer
    (*StopSd)();  // Call the Function with the pointer

    space();

    StartSd(); // Call the function with the pointer
    StopSd();  // Call the function with the pointer

    space();

    StartSound(); // Calling the function by name.
    StopSound();  // Calling the function by name.
}

how to make pointers in c

datatype *var;

variable var actually holds the address of the data(memory where it is stored)
*var lets you access the data stored at that address

function pointer in c

// Basic syntax
ret_type (*fun_ptr)(arg_type1, arg_type2,..., arg_typen);

// Example
void fun(int a)
{
    printf("Value of a is %d
", a);
}

// fun_ptr is a pointer to function fun() 
void (*fun_ptr)(int) = &fun;