Question

我的问题是，当我编译并运行程序时，小时并没有“小时”列出1,2,3，因为循环继续，并且每行的循环计算也相同。

这就是程序的样子 http://postimg.org/image/htk194eah/

计算错误，小时数假设为1,2 ... 5

我希望它看起来像这样 http://postimg.org/image/pnkvab1j1/

这是我到目前为止所做的：

int main()
{
    // Variables 
    int speed; 
    int time; 
    int distance; 

    // Obtain the speed


    cout << "Please input the speed of the vehicle  " ;
        cin >> speed;

  while(speed < 0) // while statement  
  {
   cout << "Please refrain from using a negative number   ";
        cin >> speed;
  }
     cout << "Please enter the time, represented in hours, travelled" <<endl;
     cin >> time;

   // Obtain the time
       while(speed < 1) 
  {
       cout<< "Please use a number greater than 1 " <<endl;
       cin >> time;
  }  

    // Calculation
    distance = speed * time;

    cout << endl;
    cout << "Hour(s) " << "\t" << "Distance Travelled" << endl;
    cout << "____________________________________________" << endl;

    // "for" Loop statement
    for(int count =1; count <= time; count++)
  {
        cout << " " << "\t\t" << speed*time << endl;

  }



system ("PAUSE");

return 0;
}

Answer 1

当您在for循环中打印时，速度= 20且时间= 5，因此它始终打印100（在您给出的示例中）。

您希望打印速度*计数（在这种情况下）。

再次打印＆＃34;＆＃34;对于小时，这是一个空字符串，您希望打印计数。

cout << count << "\t\t" << speed*count << endl;

Answer 2

这是正确的程序。你的节目非常好。但是你有一个很小的错误。

#include<iostream.h>
    main()
    {
        // Variables 
        int speed; 
        int time; 
        int distance; 

        // Obtain the speed


        cout << "Please input the speed of the vehicle  " ;
        cin >> speed;

      while(speed < 0) // while statement  
      {
       cout << "Please refrain from using a negative number   ";
            cin >> speed;
      }
      cout << "Please enter the time, represented in hours, travelled ";
      cin >> time;

       // Obtain the time
           while(speed < 1) 
      {
           cout<< "Please use a number greater than 1 ";
           cin >> time;
      }  

        // Calculation


        cout << endl;
        cout << "Hour(s) " << "\t" << "Distance Travelled" << endl;
        cout << "____________________________________________" << endl;

        // "for" Loop statement
        for(int count =1; count <= time; count++)
      {
            cout << count << "\t\t" << speed * count << endl;

      }



    system ("PAUSE");

    return 0;
    }

C ++输入和输出问题

2 个答案: