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Код: Выделить всё

#include <iostream>
#include <cmath>
int main()
{
   const unsigned n = 10;
   float X = 5.45;
   int A[n] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
   unsigned first = 0;
   unsigned second = 1;
   float diff = std::abs(((A[first] + A[second]) / 2) - X);
   for (unsigned i = 0; i < n-1; ++i)
   {
      for (unsigned j = i+1; j < n; ++j)
      {
         float calc = std::abs(((A[i] + A[j]) / 2) - X);
         if (calc < diff)
         {
            diff = calc;
            first = i;
            second = j;
         }
      }
   }
   std::cout << "A[" << first << "] = " << A[first] << std::endl;
   std::cout << "A[" << second << "] = " << A[second] << std::endl;
   std::cout << "average = " << ((A[first] + A[second]) / 2) << std::endl;
   return 0;
}

Код: Выделить всё

if (calc < diff)
         {
            diff = calc;
            first = i;
            second = j;
          // Сюда ставил?
         }

Код: Выделить всё

std::cout << "average = " << (A[first] + A[first]) / 2.0f << std::endl;