javascript - Change a function dynamically in C -

i know if there equivalent in c (for void function) javascript code:

var myfunction; myfunction = function(){     //some code } 

not equivalent (because c static language without support anonymous or nested functions) can have variable pointer function, , make point different compiled functions matching type of variable.

very simple , basic example:

#include <stdio.h>  void function1(void) {     printf("function1\n"); }  void function2(void) {     printf("function2\n"); }  int main(void) {     // declare variable pointer function taking no arguments     // , returning nothing     void (*ptr_to_fun)(void);      ptr_to_fun = &function2;     ptr_to_fun();      ptr_to_fun = &function1;     ptr_to_fun();      return 0; } 

the above program print out

 function2 function1