#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;
??????????? //printf("+%d\n",i);
??????? }
??????? else
??????? {
??????????? sum-=i;
??????????? //printf("-%d\n",i);
??????? }
??????? i++;
???????
??? }
??
??? printf("sum=%d\n",sum);
???
??? return 0;???