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  • Sum Problem-hdu-1001

    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>
    #include<stdlib.h>
    int main()
    {
        int n,sum;
        while(scanf("%d",&n)!=EOF)//多次输入
        {
            sum=0;//放入循环体内,保证每次sum都被清0
            while(n)//当n!=0时,执行循环
            {
                sum+=n;//累加
                n=n-1;
            }
            printf("%d
    
    ",sum);//输出结果
        }
    return 0;
    }
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  • 原文地址:https://www.cnblogs.com/Eric-keke/p/4374163.html
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