[cooop]

#include <iostream>
#include <cmath>
#include <stdio>
using namespace std;
int main ()
    { 
      float first_num, second_num; 
      int which_one;          
      float result;  
      float dfirst;
float  dsecond;
float  dnum1;
float  dnum2;          
      cout << "Please enter the first number : ";
      cin >> first_num;
      cout << "Please enter the second number : ";
      cin >> second_num;

      cout << "Press 1 to add the two numbers"
           << endl
           << "Press 2 to subtract the two numbers."
           << endl
           << "Press 3 to multiply the two numbers."
           << endl
           << "Press 4 to divide the two numbers."
           << endl
           << "Press 5 to sqrt numbers."
           << endl
           << "Press 6 to power the two numbers."
           << endl
            << "Press 7 to log the two numbers."
           << endl;
           
           
           
      cin >> which_one;
      if (which_one == 1)
        result = first_num + second_num;
      if (which_one == 2)
        result = first_num - second_num;
      if (which_one == 3)
        result = first_num * second_num;
      if (which_one == 4)
        result = first_num / second_num;
      if (which_one ==5)
       result = sqrt(first_num);
       if (which_one == 6)
        result = pow(first_num , second_num);
         if (which_one == 7)
        result = log(first_num );
        
        
      cout << "The result is " << result << endl;
    
int f;
cin >> f;
return 0;
}

what is goto statement ?
and how can i write c,q,ln ?