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  • hdu1001

    //c
    #include "stdio.h"
    int main() {
    int a = 0, sum = 0;
    while (scanf("%d", & a) != EOF) {
    if ((a << 31) >> 31 == 0) {
    sum = a / 2;
    sum *= a + 1;
    printf("%d ", sum);
    } else {
    sum = (a + 1) / 2;
    sum *= a;
    printf("%d ", sum);
    }
    }
    return 0;
    }

    //c++
    #include "iostream"
    using namespace std;
    int main() {
    int a = 0, sum = 0;
    while (cin >> a) {
    if ((a << 31) >> 31 == 0) {
    sum = a / 2;
    sum *= a + 1;
    cout << sum << endl;
    cout << endl;
    } else {
    sum = (a + 1) / 2;
    sum *= a;
    cout << sum << endl;
    cout << endl;
    }
    }
    return 0;
    }

    //c#
    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    namespace csharp {
    class Program {
    static void Main(string[] args) {
    string s;
    int a, sum;
    while ((s = Console.ReadLine()) != null) {
    a = Convert.ToInt32(s);
    if ((a << 31) >> 31 == 0) {
    sum = a / 2;
    sum *= a + 1;
    Console.WriteLine("{0} ", sum);
    } else {
    sum = (a + 1) / 2;
    sum *= a;
    Console.WriteLine("{0} ", sum);
    }
    }
    }
    }
    }

    //java
    import java.util.Scanner;
    public class Main {
    public static void main(String args[]) {
    Scanner s = new Scanner(System. in );
    while (s.hasNextInt()) {
    int n = s.nextInt();
    if ((n << 31) >> 31 == 0) {
    int sum = n / 2;
    sum = sum * (n + 1);
    System.out.println(sum);
    System.out.println();
    } else {
    int sum = (n + 1) / 2;
    sum = sum * n;
    System.out.println(sum);
    System.out.println();
    }
    }
    }
    }

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  • 原文地址:https://www.cnblogs.com/wangkun1993/p/6268984.html
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