#include <stdio.h>

#include <stdlib.h>

/* $begin inplace-swap-a */

/* $begin inplace-swap-b */

void inplace_swap(int *x, int *y) {

/* $end inplace-swap-b */

*y = *x ^ *y; /* Step 1 */

*x = *x ^ *y; /* Step 2 */

*y = *x ^ *y; /* Step 3 */

}

/* $end inplace-swap-a */

void inplace_swap_b(int *x, int *y) {

/* $begin inplace-swap-b */

*x = *x ^ *y; /* Step 1 */

*y = *x ^ *y; /* Step 2 */

*x = *x ^ *y; /* Step 3 */

}

/* $end inplace-swap-b */

/* $begin reverse-array */

void reverse_array(int a[], int cnt) {

int first, last;

for (first = 0, last = cnt-1;

first <= last; //line:data:prob:reverse

first++,last--)

inplace_swap(&a[first], &a[last]);

}

/* $end reverse-array */

void fix_reverse_array(int a[], int cnt) {

int first, last;

for (first = 0, last = cnt-1;

first < last;

first++,last--)

inplace_swap(&a[first], &a[last]);

}

int main(int argc, char *argv[]) {

int *a = calloc(argc-1, sizeof(int));

int cnt = argc-1;

int i;

for (i = 0; i < cnt; i++) {

a[i] = atoi(argv[i+1]);

}

printf("First version:\n");

printf(" Initially: a[0..%d] =", cnt-1);

for (i = 0; i < cnt; i++)

printf(" %d", a[i]);

printf("\n");

reverse_array(a, cnt);

printf(" Finally: a[0..%d] =", cnt-1);

for (i = 0; i < cnt; i++)

printf(" %d", a[i]);

printf("\n");

for (i = 0; i < cnt; i++) {

a[i] = atoi(argv[i+1]);

}

printf("Second version:\n");

printf(" Initially: a[0..%d] =", cnt-1);

for (i = 0; i < cnt; i++)

printf(" %d", a[i]);

printf("\n");

fix_reverse_array(a, cnt);

printf(" Finally: a[0..%d] =", cnt-1);

for (i = 0; i < cnt; i++)

printf(" %d", a[i]);

printf("\n");

return 0;

}