Can u guys help me to find errors of this programme!

#include<iostream>
#include<conio>
#include<string>

using namespace std;

string employeeName;
int employeeNumber;
double employeeSalary;
char employeeType;

class Employee{
	private:
   	 string employeeName;
         int employeeNumber;
         double employeeSalary;
         string employeeType;

   public:
         void promotion(){
         	calc_salary('pr');
         }
         void demotion(){
            calc_salary('de');
         }
   		void calc_salary(char ch){
            float salSalary,comSalary,hourSalary ;

         	if(ch=='pr'){
            	switch(employeeType[0]){
                  case 'S':
                  	salSalary = (employeeSalary*125)/100;
                     break;

                  case 'C':
                     int sale,commission;
                     cout<<"Please Enter number of sales : ";
                     cin>>sale;
                     cout<<"Please Enter commission percentage : ";
                     cin>>commission;
                  	comSalary = ((employeeSalary*115)/100 + sale*commission );
                     break;

                  case 'H':
                  	int hour,hrate;
                     cout<<"Please Enter number of hours : ";
                     cin>>hour;
                     cout<<"Please Enter hour rate : ";
                     cin>>hrate;
                     hourSalary = (hour*(hrate*110)/100);
                     break;
               }
            }
            else if(ch=='de'){
               float salSalaryd,comSalaryd,hourSalary;

            	switch(employeeType[0]){
               	case 'S':
                  	salSalaryd = (employeeSalary*85)/100;
                     break;
                  case 'C':
                     int sale,commission;
                     cout<<"Please Enter number of sales : ";
                     cin>>sale;
                     cout<<"Please Enter commission percentage : ";
                     cin>>commission;
                  	comSalaryd = ((employeeSalary*90)/100 + sale*commission);
                     break;

                  case 'H':
                  	int hour,hrate;
                     cout<<"Please Enter number of hours : ";
                     cin>>hour;
                     cout<<"Please Enter hour rate : ";
                     cin>>hrate;
                     hourSalary = (hour*(hrate*95)/100);
                     break;

               }
            }

         }

   void setName(string n){
   	employeeName = n;
   }
   void setNumber(int num){
   	employeeNumber = num;
   }
   void setSalary(double s){
   	employeeSalary = s;
   }
   void setType(string t){
   	employeeType = t;
   }

   string getName(){
   	return employeeName;
   }

   int getNumber(){
   	return employeeNumber;
   }

   double getSalary(){
   	return employeeSalary;
   }

   string getType(){
   	return employeeType;
   }
}



void main(){
  // string employeeName;
  // int employeeNumber;
  // double employeeSalary;
  // char employeeType;

   clrscr();

   //creating object
   Employee emp;

   cout<<"\nPlease Enter Employee Name : ";
   cin>>employeeName;
   emp.setName(employeeName);

   cout<<"\nPlease Enter Employee Number : ";
   cin>>employeeNumber;
   emp.setNumber(employeeNumber);

   cout<<"\nPlease Enter Employee Salary : ";
   cin>>employeeSalary;
   emp.setSalary(employeeSalary);

   cout<<"\nPlease Enter Employee Type ( Salaried = S , Commission = C , Hourly = H ) : ";
   cin>>employeeType;
   if(employeeType== 'S')
		emp.setType("Salaried Employee");
	else if(employeeType== 'C')
		emp.setType("Commissioned Employee");
	else if(employeeType== 'H')
		emp.setType("Hourly Employee");

   cout<<"\n\t***  Employee Details  *** ";
   cout<<"\n\nEmployee Name : "<<emp.getName();
   cout<<"\nEmployee Number : "<<emp.getNumber();
   cout<<"\nEmployee Salary before promotion or demotion : "<<emp.getSalary();
   cout<<"\nEmployee Type : "<<emp.getType();
   cout<<"\nEmployee Salary after promotion : ";
   emp.promotion();
   cout<<emp.getSalary();
   cout<<"\nEmployee Salary after demotion : ";
   emp.demotion();
   cout<<emp.getSalary();


   getch();

}

Can you compile? Does it fail with a runtime error? Does it run successfully but with unexpected behavior? Throw us a bone here. Just posting code and asking "what's wrong?" is a fantastic way to get ignored.

It says

error: two or more data types in declaration of ‘main’
and
coino: No such file or directory

This is my main method

void main(){
  // string employeeName;
  // int employeeNumber;
  // double employeeSalary;
  // char employeeType;
 
   clrscr();
 
   //creating object
   Employee emp;
 
   cout<<"\nPlease Enter Employee Name : ";
   cin>>employeeName;
   emp.setName(employeeName);
 
   cout<<"\nPlease Enter Employee Number : ";
   cin>>employeeNumber;
   emp.setNumber(employeeNumber);
 
   cout<<"\nPlease Enter Employee Salary : ";
   cin>>employeeSalary;
   emp.setSalary(employeeSalary);
 
   cout<<"\nPlease Enter Employee Type ( Salaried = S , Commission = C , Hourly = H ) : ";
   cin>>employeeType;
   if(employeeType== 'S')
		emp.setType("Salaried Employee");
	else if(employeeType== 'C')
		emp.setType("Commissioned Employee");
	else if(employeeType== 'H')
		emp.setType("Hourly Employee");
 
   cout<<"\n\t***  Employee Details  *** ";
   cout<<"\n\nEmployee Name : "<<emp.getName();
   cout<<"\nEmployee Number : "<<emp.getNumber();
   cout<<"\nEmployee Salary before promotion or demotion : "<<emp.getSalary();
   cout<<"\nEmployee Type : "<<emp.getType();
   cout<<"\nEmployee Salary after promotion : ";
   emp.promotion();
   cout<<emp.getSalary();
   cout<<"\nEmployee Salary after demotion : ";
   emp.demotion();
   cout<<emp.getSalary();
 
 
   getch();
 
}

Standart definition of main is:
int main() or
int main(int , char**)

Conio.h is a Microsoft header file, so NOT every compiler has it. You can check in include directory of your compiler.

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