system("cls");

goto again;

case '/'://判断是否是除法 scanf("%d",&s); a=n/s; gotoxy(5,1); printf("=%d",a);

system("pause");//按任意键继续 system("cls"); goto again;

default:gotoxy(5,1);printf(" error"); }

system("pause");//按任意键继续 system("cls"); goto again;

return 0; }

void nnn() {

printf("┌─────────┐\n"); printf("│ │\n"); printf("└─────────┘\n"); printf(" ① ② ③ ④ ⑤ \n"); printf(" ⑥ ⑦ ⑧ ⑨ ◎ \n"); printf(" ┼ ─ × ÷ ＝ \n");