引用与指针

// 写了一个小玩意，复习了一下指针和引用，虽然简单吧，但是还是挺容易错的。 #include<cstdio> #include<iostream> #include<algorithm> #include<cstring> using namespace std; int cg(int &a,int &b) { int c; c = a; a = b; b = c; } int main() { int a,b; scanf("%d%d",&a,&b); printf("%d %d\n",a,b); // 1 int &d = a; int &e = b; int mid; mid = d; d = e; e = mid; printf("%d %d\n",a,b); // 2 cg(a,b); printf("%d %d\n",a,b); // 3 int *f = &a; int **fl = &f; int *g = &b; int **gl = &g; mid = **fl; **fl = **gl; **gl = mid; printf("%d %d\n",a,b); //4 int *p = &a; int *q = &b; int *&pl = p; int *&ql = q; mid = *pl; *pl = *ql; *ql = mid; printf("%d %d\n",a,b); // 5 int *h = &a; int **hl = &h; int *k = &b; int *&kll = k; mid = **hl; **hl = *kll; *kll = mid; printf("%d %d\n",a,b); //6 return 0; }