1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | #include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
// okay to copy/adapt these macros
#define log_int(n) printf("%s == %d\n", (#n), n)
#define log_addr(n) printf("%s == %p\n", (#n), (void*)n)
void swap(int** a_a_left, int** a_a_right) {
int* a_left_num = *a_a_left;
int* a_right_num = *a_a_right;
*a_a_left = a_right_num;
*a_a_right = a_left_num;
}
int main(int argc, char* argv[]) {
int n1 = 5;
int n2 = 27;
log_int(n1);
log_int(n2);
int* a_n1 = &n1;
int* a_n2 = &n2;
log_addr(&n1);
log_addr(&n2);
log_addr(a_n1);
log_addr(a_n2);
log_int(*a_n1);
log_int(*a_n2);
swap(&a_n1, &a_n2);
printf("Swap called\n");
// did not swap
log_int(n1);
log_int(n2);
log_addr(&n1);
log_addr(&n2);
// did swap
log_addr(a_n1);
log_addr(a_n2);
log_int(*a_n1);
log_int(*a_n2);
return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */
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