這是例子int results = 98;??? //results為所考成績(jī)int ranking = 2;??? //ranking為所考排名if(results > 90){?????????????if(ranking<=3)???????????? {????????????????????? printf("%s\n","吃大餐，");???????????? }???????????? printf("%s\n","買玩具");}else{??????????? printf("%s\n","沒有獎(jiǎng)勵(lì)");}?為什么這種省略掉外層的else就可以#include <stdio.h>int main() {??? int sale=120; //銷售業(yè)績(jī)?yōu)?20萬??? int year=1; //剛剛進(jìn)入公司1年??? //完善代碼??? if(sale > 100)??? {??????? if(year >= 2)??????? {??????????? printf("%s\n","優(yōu)秀員工獎(jiǎng)");??????? }??? ???? else???? {???? printf("%s\n","很遺憾，期望你再接再厲");???? }??? }??? ??? return 0;}??而括號(hào)換個(gè)位置，例如例句這種模式，省略掉里層的的else 就不可以?#include <stdio.h>int main() {??? int sale=120; //銷售業(yè)績(jī)?yōu)?20萬??? int year=1; //剛剛進(jìn)入公司1年??? //完善代碼??? if(sale > 100)??? {??????? if(year >= 2)??????? {??????????? printf("%s\n","優(yōu)秀員工獎(jiǎng)");??????? }??? }???? else???? {???? printf("%s\n","很遺憾，期望你再接再厲");???? }??? ??? ??? return 0;}???