Question

c语言编程sum problem

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

Answer 1

#include<stdio.h>
void main()
{
int i,j,n,sum=0;
printf("输入计算组数i: ");
scanf("%d",&i);
printf("\n");
while(i--)
{
scanf("%d",&n);
for(j=1;j<=n;j++)
{
sum+=j;
}
printf("%d\n",sum);
}
}