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杭电ACM 1001 Sum Problem

neuxxm posted @ 2011年5月19日 22:13 in 杭电ACM 解题报告 with tags Math Math_求和 , 3140 阅读

Sum Problem

Time Limit: 1000/500 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 108140 Accepted Submission(s): 24596

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

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

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