/*這是一個函數(shù)式宏，要求把type型的a,b兩值互換*/ #include?<stdio.h> #define?swap(type,?a,?b)?do?{?\?????/*就是這個do...while語句不太懂*/ type?t;?\???/*這里為什么可以有另一個變量t,為什么要這樣寫啊*/ t?=?a;?\ a?=?b;?\ b?=?t;?\ }?while?(0); int?main(void) { int?nx,?ny; puts("please?enter?two?integer"); printf("integer?A:?"); scanf("%d",?&nx); printf("integer?B:?"); scanf("%d",?&ny); printf("A:?%d????B:?%d\n",?nx,?ny); swap(int,?nx,?ny); printf("A:?%d????B:?%d\n",?nx,?ny); return?0; }