HDU 1001 Sum Problem C/C++

2024年1月3日 128次阅读

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   C语言:

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

C++:

#include <iostream>
using namespace std;
main() {
    int sum, n, i;
    while (cin >> n) {
        sum = 0;
        for (i = 0; i <= n; i++) {
           sum += i;
        }
        cout << sum << endl << endl;
    }
}

在这里提醒大家,换行符(\n和endl)一定要两个,否则会提示Presentation Error.

 

代码仅供参考，如果哪里有不足，欢迎各位指教，我一定会及时进行改进和优化。

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2015.2.7 黑骐

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