FAFU OJ 求1到n和

求1到n和

Time Limit:1000MSMemory Limit:65536KBTotal Submissions:669Accepted:484Share

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;}