将变量分配给数组的函数

Question

我正在为学校做编程作业， （只需要我原始代码的一部分的帮助，而不是作业求解器，谢谢。） 而我的函数 findHighest() 无法正常工作。我相信它只有零，而不是存储传递给它的双精度值的数组。 我需要帮助来解决这个问题。 谢谢

int main()
{
double nEast = 0, sEast = 0, nWest = 0, sWest = 0;

cout << "\n\n\t\tQuarterly Sales Report by region\n";

cout << "\n\nNorth East region:\n" ;
nEast = getSales(nEast);
cout << "\n\nSouth East region:\n";
sEast = getSales(sEast);
cout << "\n\nNorth West region:\n";
nWest = getSales(nWest);
cout << "\n\nSouth West region:\n";
sWest = getSales(sWest);

findHighest(nEast, sEast, nWest, sWest);

return 0;
}




void findHighest (double nEast, double sEast, double nWest, double sWest)
{
double regions[4] = {nEast, sEast, nWest, sWest};
double temp = 0;


for(int i = 0; i <= 3;)
{
    if(regions[i] >= temp)
    {
        temp = regions[i];
        cout << temp;
        i++;
    }
}
cout << "The biggest number is: " << temp << endl;
}

Answer 1

试试下面的

#include <algorithm>

//...

void findHighest( double nEast, double sEast, double nWest, double sWest )
{
   std::cout << "The biggest number is: " 
             << std::max( { nEast, sEast, nWest, sWest } )  << std::endl;
}

或者你可以写

void findHighest( double nEast, double sEast, double nWest, double sWest )
{
   double max = nEast;
   if ( max < sEast ) max = sEast;
   if ( max < nWest ) max = nWest;
   if ( nax < sWest ) max = sWest;

   std::cout << "The biggest number is: " 
             << max  << std::endl;
}

或使用数组的另一种解决方案

void findHighest( double nEast, double sEast, double nWest, double sWest )
{
   double regions[] = { nEast, sEast, nWest, sWest };       

   double max = regions[0];
   for ( double x : regions )
   {
      if ( max < x ) max = x;
   }

   std::cout << "The biggest number is: " 
             << max  << std::endl;
}

第一种和第三种解决方案基于 C++ 2011 的特性。但是在第三种解决方案中，您可以简单地将基于范围的 for 语句替换为普通的 for 循环。这是你的任务。:)