C pointers - Point to the same address

Question

#include 
#include 

void foo(int *a, int *b);

void foo(int *a, int *b) {
    *a = 5;
    *b = 6;
    a = b;
}

int main(void) {
    int          


        

Answer 1

Because when foo is called, the values of the pointers are copied into the function. If you want to change the values of the pointers themselves, you need to pass a pointer to a pointer into the function.