http://acm.hdu.edu.cn/showproblem.php?pid=1001
Sum Problem Time Limit: 1000/500 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Problem Description Hey, welcome to HDOJ(Hangzhou Dianzi University Online Judge). 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. You may assume the result will be in the range of 32-bit signed integer.
Sample Input
1 100
Sample Output
1 5050
Author DOOM III |
#include<stdio.h>
int main()
{
int n,sum;
while(scanf("%d",&n)!=EOF)
{
sum=0;
while(n)
{
sum+=n;
n--;
}
printf("%d\n\n",sum);
}
return 0;
}
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