//运行时向用户提问“你考了多少分？（0~100）”。接收输入后判断其等级并显示出来，规则如下： //优（90<=score<=100）良（80<=score<90）中 (60<=score<80) 差（0<=score<60） -// Run-time to the user question how many points you test? (0 to 100). After receiving input to determin