... 表示范围 case 0...4; // error case 5 ... 9; // ok eg 1:char ch = 4;switch(ch){ case 1: printf(" into 1\n");break; case 3 ... 8: printf( " into 2 to 8\n");break;}out:into 2 to 8 eg 2:
switch(c) { case 'a' ... 'z': 操作 break; case 'A' ... 'Z': 操作 break; case '0' ... '9': 操作 break;
case 1: case 2: case 3:操作 break; default:操作 break;
}