求1到N的和

求1到N的和

/problem-sets/1325975206586703872/problems/1325979500966797314

#include<stdio.h>
int main(void)
{
	int i,N;int sum=0;
	scanf("%d",&N);
	for(i=1;i<=N;i++)sum=sum+i;
	printf("sum = %d",sum);
	return 0;
}