#include?<stdio.h>
int?main()?
{
????int?score?=?87;?//考試分?jǐn)?shù)為87分?
????score=score/10;
????switch(score)
????{
????????/*想想以下代碼為什么用這種方式；
??????????這種方式的好處？*/
????????case?10:
????????case?9:
????????????printf("等級A");
????????????break;
????????case?8:
????????????printf("等級B");
????????????????????????????//這里是不是缺點(diǎn)什么？????????????
????????case?7:
????????case?6:?
????????????printf("等級C");
????????????????????????????//這里是不是缺點(diǎn)什么？??
????????default:
????????????printf("等級D");
????????????break;????
????}
????return?0;
}

這道題是通過分?jǐn)?shù)劃分等級的，100~90,89~80,79~70,69~60,60以下，觀察分?jǐn)?shù)與等級，分?jǐn)?shù)的個(gè)位數(shù)并不重要，判斷的依據(jù)是分?jǐn)?shù)的十位和百位，所以先對分?jǐn)?shù)除10，去掉個(gè)位。