Problem Description
In this problem, your task is to calculate SUM(n) = 1 + 2 + 3 + ... + n.
Input
The input will consist of a series of integers n, one integer per line.
Output
For each case, output SUM(n) in one line, followed by a blank line.
- Code
- #include<stdio.h>
- int main()
- {
- int i,n,sum;
- while(scanf("%d",&n)!=EOF)
- {
- sum=0;
- for(i=1;i<=n;i++)
- sum+=i;
- printf("%d\n\n",sum);
- }
- return 0;
- }
- Sum Problem
来源: http://www.bubuko.com/infodetail-2695283.html