Function not working correctly

[aaronpeart]

Why isn't my function accepting other inputs for the second and third. It just spits out random giant numbers for highest

 #include <iostream>


using namespace std;

void setFirst(int& first);
void setSecond(int& second);
void setThird(int& third);

int getFirst(int& first);
int getSecond(int& second);
int getThird(int& third);

int getHighest(int first, int second, int third);
int getLowest(int first, int second, int third);
int getMiddle(int first, int second, int third);

void showResults(int first, int second, int third);

int main(){
   int first;
   int second;
   int third;
   
   setFirst(first);
   showResults(first, second, third);
   cin >> first;
   
   
   setSecond(second);
   showResults(first, second, third);
   cin >> second;
   
   
   setThird(third);
   showResults(first, second, third);
   cin >> third;

   
   int getHighest(int first, int second, int third);
   int getLowest(int first, int second, int third);
   int getMiddle(int first, int second, int third);
   
   void showResults(int first, int second, int third);

   return 0;
}

void setFirst(int& first)
{
   cout << "please enter the first number: ";
   cin >> first;
}

void setSecond(int& second)
{
   cout << "please enter the second number: ";
   cin >> second;
}

void setThird(int& third)
{
   cout << "please enter the third number: ";
   cin >> third;
}

int getFirst(int& first)
{
   return first;
}

int getSecond(int& second)
{
   return second;
}


int getThird(int& third)
{
   return third;
}


int getHighest(int first, int second, int third)
{
   int highest;
   
   
   if(getFirst(first)>second && third)
      highest = first;
   if(getSecond(second)>third && first)
      highest = second;
   if(getThird(third)>second && first)
      highest = third;
      
   return highest;
}

int getLowest(int first, int second, int third)
{
   int lowest;
   
     
   if(getFirst(first)<second && third)
      lowest = first;
   if(getSecond(second)<third && first)
      lowest = second;
   if(getThird(third)<second && first)
      lowest = third;
      
   return lowest;
}

int getMiddle(int first, int second, int third)
{
   int middle;
      
   if(getFirst(first)>second && getFirst(first)<third)
      middle = first;
   if(getSecond(second)>third && getSecond(second)<first)
      middle = second;
   if(getThird(third)>second && getThird(third)<first)
      middle = third;
      
   return middle;
}

void showResults(int first, int second, int third){
   cout << "the highest value was: "
        << getHighest(first, second, third) << endl;
   cout << "the middle value was: "
        << getMiddle(first,second,third) << endl;
   cout << "the lowest value was: "
        << getLowest(first,second,third) << endl;
     
}

[icy1]

You copy-pasted declarations into your main method. Also your methods already call cin(), so you don't need to call it again, and you only want to show your results once, when you have all three. Should look like:

int main()
{
   int first;
   int second;
   int third;
   
   setFirst(first);
   setSecond(second);
   setThird(third);
   
   showResults(first, second, third);
   
   return 0;
}