请编写函数sum,其功能:用while循环语句求1到n之间(包括n)能被3整除的所有整数之和

#include <stdio.h>
int sum(int num)
{
int i=0, result=0;
while (i <= num)
{
if (i%3==0)
result = result+i;
++i;
}
return result;
}
如有2113帮5261助，4102请采1653纳！回！答！

英文介绍你最喜欢的一个app，英语作文100词

Nowdays,there many apps on our smartphone,them help us to deal with the problem we met in daily life.Take myself as an example:my fovorite app is baidizhidao.When I was troubled by some problmes,I always tend to smart people on baiduzhidao for help.Its a really useful app.
in my spare time,I also will tap the logo on my cellphone to check if there are any one I can use my limited knowledge to help.Its really nice to share your idea and opinion with others

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