深入理解计算机系统 习题 1

#include <stdio.h>


int main() {
int a, b, mid;
scanf("%d%d", &a, &b);
mid = a;
a = b;
b = mid;
printf("%d %d\n", a, b);


return 0;

}

#include <stdio.h>
#include <limits.h>


//exercise 2.10
void inplace_swap(int *x, int *y) {
*y = *x ^ *y;
*x = *x ^ *y;
*y = *x ^ *y;
}


void 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 a[] = {1,2,3,4,5,6};
int cnt = 6;
int i;


reverse_array(a, cnt);


for(i = 0; i < cnt; i++) {
printf("%d\n", a[i]);
}



return 0;
}