How to pass variables in a function??

Question

Like I wanted to make a function that would swap the values of the variables I pass to it. like.

Void swap(a,b);
And I want it to change the value of a and b without having to write any other command but the problem is that you can only pass the values to the function but not variables that it can manipulate
How to solve this

Answer 1

Thanks

Answer 2

Nobody but i want to know how to do that please can you help

Answer 3

No, but thanks for those two keywords thank you very much (where are you from)

Answer 4

Do swap(&a,&b), but first the swap most declared was void swap(int *a, int *b)