In C, what is the difference between `&function` and `function` when passed as arguments?

Question

For example:

#include 

typedef void (* proto_1)();
typedef void proto_2();

void my_function(int j){
    printf(\"hello from function. I got          


        

Answer 1

There is no difference between &function and function - they're both addresses. You can see this by printing them both:

function bar(); 

.... 
printf("addr bar is 0x%d\n", &bar);
printf("bar is 0x%d\n", bar);