lua function

local function demoA()
    print "demoA"
end

local function demoB ()
    print "demoB"
end

local function forfun()
    print "in forfun"
end

forfun( demoB )
print("========")
forfun( demoA() )

in forfun
========
demoA
in forfun
[Finished in 0.0s]

local function forfun_demo( pf )
    pf()
    print "in forfun_demo"
end

forfun_demo( demoB )

demoB
in forfun_demo

 1 #include <stdio.h> 
 2 
 3 void fun1(){ 
 4      printf("\n Hello World! \n"); 
 5 }  
 6 
 7 // void fun2(){ 
 8 //     fun1(); 
 9 // }  
10 
11 void fun3(void(*p)()){
12     p();
13 }
14 
15 int main(){ 
16     
17     // fun2(fun1); 
18     fun3(fun1);
19 
20     return 0;  
21 }