Question

I have this function:
void func(int a, int b, char s, FILE *fp, int flag)

and i want to use the function’s args based on the flag. For example:

func(num, NOTHING, NOTHING, file, 1)
func(num, othernum, NOTHING, NOTHING, 2)
and on the function this_is_function i want to have:

void func(int a, int b, char s, FILE *fp, int flag){
if(flag == 1){
/* use a and file */
}
if(flag == 2){
/* use a,b */
}
/* etc etc */
}

i would like to know if it is possible and how to do this!
Thanks in advance 🙂

Answer 1

You can pass 0 to int and char and NULL for pointers when you call the function and the arguments are not used.

func(num, 0, 0, file, 1)
func(num, othernum, 0, NULL, 2)

You can also use variadic functions. Variadic functions are functions with a variable number of arguments.