小编Reg*_*lva的帖子

如何计算系列1 + 1/1!+ 1/2!+ 1/3!+ ... + 1/N!在C++中？我有一个大纲:

#include <iostream>
using namespace std;
int main()
{
    int n, i, j, fat;
    float soma = 0.0;
    cin >> n;
    for (i = 1; i <= n; i++)
    {

        fat = 1;
        soma += 1 / fat;
        for (j = 1; j <= n; j++)
        {
            fat *= j;
        }
    }
    cout << soma << endl;
    return 0;
}

如何从条件中将注释作为单元格返回.

例:

=if(a1=0;insert comment on cell)

插入评论并显示评论

我尝试在模板中返回计数注册以进行销售。我使用列表视图。我需要销售的返回计数寄存器。

我试试

#models.py
class Sale(models.Model):
    customer = models.ForeignKey(Customer)
...
    def __unicode__(self):
        return unicode(self.date_sale)

...
    @property
    def get_counter(self):
        return Sale.objects.count()

#views.py
class SaleList(ListView):
    template_name = 'sale_list.html'
    model = Sale
    context_object = 'sale_list'
    paginate_by = 10

#sale_list.html
{{ sale.get_counter }}

但不工作。

如何返回销售计数寄存器？

考虑这个模型

class Dealership(models.Model):
    dealership = models.CharField(max_length=50)

class Ordered(models.Model):
    customer = models.ForeignKey("Customer")
    dealership = models.ManyToManyField("Dealership")
    status = models.CharField(max_length=2, choices=status_list, default='p')

我试试

$ ./manage.py shell
>>> from new_way.core.models import Ordered, Dealership
>>> q = Ordered.objects.all()[:5]
>>> [i.dealership for i in q.dealership.all]

并产生错误

Traceback (most recent call last):
  File "<console>", line 1, in <module>
AttributeError: 'QuerySet' object has no attribute 'dealership'

如何返回

Ordered.dealership.dealership

所有经销商均已订购。

在我的代码中,日期之间的差异是错误的,因为它应该是38天而不是8天.我该怎么办？

package random04diferencadata;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class Random04DiferencaData {

    /**
     * http://www.guj.com.br/java/9440-diferenca-entre-datas
     */
    public static void main(String[] args) {
        SimpleDateFormat sdf = new SimpleDateFormat("hh:mm dd/mm/yyyy");
        try {
            Date date1 = sdf.parse("00:00 02/11/2012");
            Date date2 = sdf.parse("10:23 10/12/2012");
            long differenceMilliSeconds = date2.getTime() - date1.getTime();
            System.out.println("diferenca em milisegundos: " + differenceMilliSeconds);
            System.out.println("diferenca em segundos: " + (differenceMilliSeconds / 1000));
            System.out.println("diferenca em minutos: " + (differenceMilliSeconds / 1000 / 60));
            System.out.println("diferenca em horas: " + (differenceMilliSeconds / 1000 / …

如何在django中的CreateView中使用上下文？

在我之前:

#views.py
from django.views.generic import CreateView
from cars.models import *

def CreateCar(CreateView):
    info_sended = False
    if request.method == 'POST':
        form = FormCar(request.POST, request.FILES)
        if form.is_valid():
            info_sended = True
            form.save()
    else:
        form = FormCar()
    ctx = {'form': form, 'info_sended':info_sended}
    return render_to_response("create_car.html", ctx,
        context_instance=RequestContext(request))

现在,有了,并尝试:

class CreateCar(CreateView):
    info_sended = False
    template_name = 'create_car.html'
    model = Car
    success_url = 'create_car' #urls name

    def form_valid(self, form):
        info_sended = True
        ctx = {'form': form, 'info_sended':info_sended}
        return super(CreateCar, self).form_valid(form)

我的html页面是:

<!-- create_car.html -->
{% extends …

Django模板中的搜索字段

如何在Django Template中创建与此图像类似的搜索字段

http://asciicasts.com/system/photos/1204/original/E354I01.png

我在github中尝试这个 https://github.com/rg3915/vendas/commit/e0c67fd8154a3b8e450ec3db38705cdd7efc1350

但我不知道如何完成.

看我的GitHub

https://github.com/rg3915/gallery

如何在Django模板上渲染图像？但他回来了:

画廊

媒体/ 3665_1280x800_8UX8tgG.jpg

环法自行车赛

媒体/ 281405_fSRBDZu.jpg

儿童自行车

如何渲染图像？

该错误是否在settings.py中

Java:如何打印矢量？

import java.util.Scanner;

public class Ed04VetorOrdenado {

    public static void main(String[] args) {
        Scanner entrada = new Scanner(System.in);
        int vet[] = new int[10];
        System.out.println("Digite 10 numeros:");
        for (int i = 0; i < vet.length; i++) {
            vet[i] = entrada.nextInt();
        }
        System.out.print("Vetor ordenado: ");
        ordenar(vet);
    }

    // Buble sort function
    static void ordenar(int[] v) {
        int troca;
        for (int i = 0; i < v.length; i++) {
            for (int j = i + 1; j < v.length; j++) {
                if (v[i] …