Unable to change values in a function

Question

I\'m starting with developing, sorry about this newbie question.

I need to create a function that swap values between 2 vars.

I have wrote this code, but no chan

Answer 1

you are passing by value. you can still pass by value but need to work with pointers.

here is the correct code needed:

void swap(int *i, int *j) {
   int t = *i;
   *i = *j;
   *j = t;
}

void main() {
   int a = 23, b = 47;
   printf("Before. a: %d, b: %d\n", a, b);
   swap(&a, &b);
   printf("After . a: %d, b: %d\n", a, b);
}

also a small document that explains "by reference" vs "by value" : http://www.tech-recipes.com/rx/1232/c-pointers-pass-by-value-pass-by-reference/