Please help im a noob at c++

//My attempt at building a mastermind game
#include <ctime>
#include <string>
#include <cstdlib>
#include <iostream>
using namespace std;
//Declaring the variables:
string compcolor1,compcolor2,compcolor3,compcolor4;
string mancolor1,mancolor2,mancolor3,mancolor4;                             
int number_of_red,number_of_green,number_of_blue,numbe  r_of_yellow,number_of_black,number_of_white;
// The function that generates four random colours out of red,green,blue,yellow,black, and white:
int random (int a)
{
string r;
if (a<5461)
{
r="red";
goto end;
}
if (a<10922)
{
r="green";
goto end;
}
if (a<16383)
{
r="blue";
goto end;
}
if (a<21844)
{
r="yellow";
goto end;
}
if (a<27305)
{
r="black";
goto end;
}
r="white";
end:
return (r);
}
// The function that compares the computer's colours to the human's colours to see if any of the human's guesses was bang on:
int compare_position_and_color (string x, string z)
{
int r;
r = 0;
if (x == z)
{
r = 1;
}
return (r);
}
// The function that compares one of the humans reds to one of the computer's reds and then takes the computer's red of the list so it cannot be counted twice:
int compare_red ()
{
int r = 0;
if (number_of_red > 0)
{
r = 1;
--number_of_red;
}
return (r);
}
//Same as above function but for green instead of red: 
int compare_green ()
{
int r = 0;
if (number_of_green > 0)
{
r = 1;
--number_of_green;
}
return (r);
}
//Same as above but for blue:
int compare_blue ()
{
int r = 0;
if (number_of_blue > 0)
{
r = 1;
--number_of_blue;
}
return (r);
}
//Same as above but for yellow:
int compare_yellow ()
{
int r = 0;
if (number_of_yellow > 0)
{
r = 1;
--number_of_yellow;
}
return (r);
}
//Same as above but for black: 
int compare_black ()
{
int r = 0;
if (number_of_black > 0)
{
r = 1;
--number_of_black;
}
return (r);
}
//Same as above but for white
int compare_white ()
{
int r = 0;
if (number_of_white > 0)
{
r = 1;
--number_of_white;
}
return (r);
}

//This function determines what colour the human's choice is so it can be sent to one of the appropriate above functions:
int compare_color (string y)
{
int r = 0;
{
if (y == "red")
{
r = compare_red ();
}
if (y == "green")
{
r = compare_green ();
}
if (y == "blue")
{
r = compare_blue ();
}
if (y == "yellow")
{
r = compare_yellow ();
}
if (y == "white")
{
r = compare_white ();
}
if (y == "black")
{
r = compare_black ();
}
}
return (r);
}
//This function is called to calculate how many of each colour are in the computer's guess:
int number_of (string g)
{ 
int r = 0;
if (compcolor1 == g) r++;
if (compcolor2 == g) r++;
if (compcolor3 == g) r++;
if (compcolor4 == g) r++;
return (r);
}
//This is the main function where all the input and output take place:
 
int main ()
{
 srand((unsigned)time(0));
compcolor1 = random (rand());
compcolor2 = random (rand());
compcolor3 = random (rand());
compcolor4 = random (rand());
number_of_red = number_of ("red");
number_of_green = number_of ("green");
number_of_blue = number_of ("blue");
number_of_yellow = number_of ("yellow");
number_of_black = number_of ("black");
number_of_white = number_of ("white");
cout << "Welcome to MasterMind by Toby Crisford - the test version.  Please note that the final version will be far better graphics and quality, this is just a sneak preview.  The 6 possible comlours that the computer can pick are red,yellow,green,blue,black, and white\n\n";
int i;
for (i=1;i<11;i++)
{
cout << "\n\nYou are on guess number " << i << " Enter you guesses below:\n\n";
cout << "guess the first colour here: ";
cin >> mancolor1;
cout << "guess the second colour here: ";
cin >> mancolor2;
cout << "guess the third colour here: ";
cin >> mancolor3;
cout << "guess the fourth colour here: ";
cin >> mancolor4; 
int result1a = compare_position_and_color (mancolor1,compcolor1);
if (result1a == 1)
{
int result1b = 0;
goto result2;
}
int result1b = compare_color (mancolor1);
result2:
int result2a = compare_position_and_color (mancolor2,compcolor2);
if (result2a == 1)
{
int result2b = 0;
goto result3;
}
int result2b = compare_color (mancolor2);
result3:
int result3a = compare_position_and_color (mancolor3,compcolor3);
if (result3a == 1)
{
int result3b = 0;
goto result4;
}
int result3b = compare_color (mancolor3);
result4:
int result4a = compare_position_and_color (mancolor4,compcolor4);
if (result4a == 1)
{
int result4b = 0;
goto endofresults;
}
int result4b = compare_color (mancolor4);
endofresults:
int correct_color;
int correct_position_and_color = result1a + result2a + result3a + result4a;
correct_color = result1b + result2b + result3b + result4b;
if (correct_position_and_color == 4) goto victory;
cout << "\n You got " << correct_position_and_color << " in the right position and " << correct_color << " in the wrong place but the right colour!";
}
cout << "\n\n You are now out of guesses I am afraid that you have lost!  better luck next time!";
cin >> i;
goto end;
victory:
cout << "\n\n Congratulations you have guessed correctly and have thus won!  I hope you enjoyed the game of mastermind - made by Toby Crisford!";
end:
return 0;
}

std::string random (int a)
{
  string r;
  if (a<5461)
  {
    r="red";
    goto end;
  }
  if (a<10922)
  {
    r="green";
    goto end;
  }
  if (a<16383)
  {
    r="blue";
    goto end;
  }
  if (a<21844)
  {
    r="yellow";
    goto end;
  }
  if (a<27305)
  {
    r="black";
    goto end;
  }
  
  r="white";
  end:
  return (r);
}

std::string random (int a)
{
  string r;

  if (a<5461)
    r="red";
  else if (a<10922)
    r="green";
  else if (a<16383)
    r="blue";
  else if (a<21844)
    r="yellow";
  else if (a<27305)
    r="black";
  else  
    r="white";
 
  return (r);
}

#include <ctime>
#include <string>
#include <cstdlib>
#include <iostream>
using namespace std;

std::string random (int a)
{
   string r;
   if (a<5461)
   {
      r="red";
      goto end;
   }
   if (a<10922)
   {
      r="green";
      goto end;
   }
   if (a<16383)
   {
      r="blue";
      goto end;
   }
   if (a<21844)
   {
      r="yellow";
      goto end;
   }
   if (a<27305)
   {
      r="black";
      goto end;
   }
   r="white";
   end:
   return (r);
}

int main()
{
   string compcolor[4];
   string mancolor[4];
   srand((unsigned)time(0));
   for (int o=0;o<4;o++)
   {
      compcolor[o] = random (rand());
   }
   cout << "Welcome to MasterMind by Toby Crisford - the test version.  Please note that the final version will be far better graphics and quality, this is just a sneak preview.  The 6 possible colours that the computer can pick are red,yellow,green,blue,black, and white\n\n";
   for (int i=1;i<11;i++)
   {
      cout << "\n\nYou are on guess number " << i << " Enter you guesses below:\n\n";
      for (int n=0;n<4;n++)
      {
         cout << "guess colour " << n+1 << " here: ";
         cin >> mancolor[n];
      }
      string comp[4];
      string man[4];
      int correct_position = 0;
      int correct_color = 0;
      for (int h=0;h<4;h++)
      {
         man[h] = mancolor[h];
      }
      for (int j=0;j<4;j++)
      {
         comp[j] = compcolor[j];
      }
      for (int k=0;k<4;k++)
      {
         if (man[k] == comp[k])
         {
            correct_position++;
            comp[k] = " ";
            man[k] = "x";
         }
      }
      for (int l=0;l<4;l++)
      {
         for (int m=0;m<4;m++)
         {
            if (man[l] == comp[m])
            {
               correct_color++;
               comp[m] = " ";
               break;
            }
         }
      }
      if (correct_position == 4)
      {
         cout << "\n\n Congratulations you have guessed correctly and have thus won!  I hope you enjoyed the game of mastermind - made by Toby Crisford!";
         break;
      }
      else
      {
         cout << "\n\n You got " << correct_position << " in the right place and " << correct_color << " In the wrong place but the right colour";
         if (i == 10)
         {
            cout << "\n\n You are out of guesses now and I'm afraid you have lost";
         }
      }
      for (int z=0;z<4;z++)
      {
         comp[z] = compcolor[z];
      }  
   }
   cout << "\n\n\nThe correct answer was " << compcolor[0] << " " << compcolor[1] << " " << compcolor[2] << " " << compcolor[3];
   int z;
   cin >> z;
   return 0;
}