Answer from cs61c-em (Jin Hyung Park 17762465) for Question 2
#include <unistd.h>

void setTo5(int *ptr)
{
    *ptr = 5;
}

int main(void)
{
    int n = 27;
 
    setTo5(&n);

    printf("n = %d\n",n);

    return 0;
}