#include <stdio.h>int main(){??? /* 小伙伴們：?????????? 選擇你們認(rèn)為最合理的循環(huán)結(jié)構(gòu)完成功能吧 */??? int sum = 0;? //定義計(jì)算結(jié)果變量sum??? int i = 1;??? //定義循環(huán)數(shù)字變量i??? int flag = 1; //定義符號(hào)狀態(tài)變量flag?? ???? //使用while循環(huán)??? while(i<=100)??? {??????? if(i%2 =0)??????? {??????????? sum-=i;??????? }??????? else??????? {??????????? sum+=i;??????? }??????? i++;??? }??? printf("sum=%d\n",sum);?? ???? return 0;?? ?}