Question

田径部门需要一个程序来计算“ n”个篮球场的面积。您被雇用撰写所有人员所覆盖的总面积的报告。（它们的总和），并报告其中最大的篮球场。您的程序应包含要写入文件的函数定义和计算除主要功能之外的最大的篮球场的函数定义。应当执行以下操作

1）程序应询问值“ n”（法院数）
2）程序要求每个法院的全名，然后是宽度和长度。（名称可以是复合名称，例如“ St James Arena”）。
3）计算n个面积和总和。（您应该循环播放if语句以确定最大的法院及其名称）
4）然后输出以下报告并将其保存到HDD中的文件中。

示例：

>BASKETBALL COURTS AREA REPORT
>Court Name             Length                 Width
>Bay Arena                  30                    28
>Michael Center             26                    23
>The total area covered by all of the them together is: 1438
>The largest basketball court is Bay Arena: 840

所以我想出了如何使用setw（）获取用户数据并按照我想要的方式打印它，但是每次它通过for循环时，它都会破坏图表。看起来像这样：

Court name: (user input)
Length: (user input)
Width: (user input) /
(prints court name) (prints length) (prints width) 

Court name: (user input)
Length: (user input)
Width: (user input) /
(prints court name) (prints length) (prints width)

而且确实如此，但是有许多法院是必需的。我不知道如何仅在最后打印所有图表以创建图表。我也不知道怎么说最大的法院的名字和地区。

#include <iostream>
#include <string>
#include <iomanip>
using namespace std;

int main (){
    string court;
    int numberofCourts, length, width, area, total;

    cout << "Number of courts: ";
    cin >> numberofCourts;
    cin.ignore();

    for (int i=1; i<=numberofCourts; i++){

        cout << "Name: ";
        getline (cin, court);

        cout << "Length: ";
        cin >> length;

        cout << "Width: ";
        cin >> width;

        if (i<=numberofCourts){
            cout << setw(10)<< court;
            cout << setw(10)<< length;
            cout << setw(10)<< width << endl;
        }
        cin.ignore();
      area= length*width;
      total+=area;

    }

    cout << "The total area covered by all of the them together is: " << total << endl;
    cout << "The largest basketball court is " << endl;

}

我完成了很大一部分，我只是不知道如何将它们拼凑在一起。

Answer 1

我不知道如何仅在最后打印所有图表以创建图表。我也不知道怎么说最大的法院的名字和地区。

您不能使用向量，假设您每次阅读法院说明时都无法自己使用/创建任何集合，则需要在文件中写入，还要计算当前的最大面积和总和，最后写入总和和最大

使用专用课程的提案：

#include <string>
#include <iostream>
#include <fstream>
#include <iomanip>

using namespace std;

struct Court {
  string name;
  int length;
  int width;

  bool read();
  void write(std::ostream & os, size_t wname, size_t wlength, size_t wwidth) const;
  int area() const { return length * width; }
};

bool Court::read() {
  cin.ignore();

  cout << "Name: ";
  if (!getline(cin, name))
    return false;

  cout << "Length: ";
  if (!(cin >> length))
    return false;

  cout << "Width: ";
  if (!(cin >> width))
    return false;

  return true;
}

void Court::write(std::ostream & os, size_t wname, size_t wlength, size_t wwidth) const 
{
  os << name;
  if (name.length() < wname)
    os << setw(wname - name.length()) << ' ';

  os << setw(wlength) << length << setw(wwidth) << width << endl;
}

void stats(int & max, int & sum, int area)
{
  if (area > max)
    max = area;

  sum += area;
}

int main ()
{
  int numberofCourts;

  cout << "Number of courts: ";
  if (!(cin >> numberofCourts)) {
    cerr << "invalid numner of courts" << endl;
    return -1;
  }

  ofstream os("courts.txt");

  if (!os.is_open()) {
    cerr << "cannot open 'courts.txt'" << endl;
    return -1;
  }

  os << "BASKETBALL COURTS AREA REPORT" << endl
    << "Court Name             Length                 Width" << endl;

  int max = 0, sum = 0;

  for (int i = 0; i != numberofCourts; ++i) {
    Court court;

    if (!court.read()){
      cerr << "error reading a court" << endl;
      return -1;
    }

    court.write(os, 23, 6, 22);
    stats(max, sum, court.area());
  }

  os << "The total area covered by all of the them together is: " << sum << endl;
  os << "The largest basketball court is: " << max << endl;

  return 0;
}

编译和执行：

pi@raspberrypi:/tmp $ g++ -pedantic -Wextra -Wall court.cc 
pi@raspberrypi:/tmp $ ./a.out
Number of courts: 2
Name: Bay Arena
Length: 30
Width: 28
Name: Michael Center
Length: 26
Width: 23
pi@raspberrypi:/tmp $ cat courts.txt 
BASKETBALL COURTS AREA REPORT
Court Name             Length                 Width
Bay Arena                  30                    28
Michael Center             26                    23
The total area covered by all of the them together is: 1438
The largest basketball court is: 840

使用用户输入（不带矢量）从For循环打印图表

1 个答案: