FAFU OJ 求1到n和

求1到n和

Time Limit:	1000MS	Memory Limit:	65536KB
Total Submissions:	669	Accepted:	484

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Description:

      给定一个n值，求sum(n)=1+2+3+……+n-1+n. 
      

Input:

输入一个正整数n.

Output:

输出1到n的和。

Sample Input:

100

Sample Output:

5050

Source:

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