assignment of lab

#include <iostream.h>

using namespace std;

int main()
{
  char yes;
  int rate,code,labour,charge,hour,cost;
  cout<<"do you want to borrow any material from us?"<<endl;
  cout<<"if yes press y."<<endl;
 cin>>yes;
if(yes=='y'||yes=='Y')
 {
  cout<<"\nwe have following materials."<<endl;
  cout<<"code  material"<<endl;
  cout<<" 1   electricals"<<endl;
  cout<<" 2   electronics"<<endl;
  cout<<" 3   construction"<<endl;
  cout<<" 4   sanitary"<<endl;
  cout<<"\nenter code of your desired material."<<endl;
  cin>>code;
  if(code==1)
  {
  cost=240;
  rate=45;
  hour=2;
  labour=rate*hour;
  charge=labour+cost;
  cout<<"\ncost of electrical material=$240"<<endl;
  cout<<"assumption rate=$45 per hour"<<endl;
  cout<<"hours of work=2 hr"<<endl;
  cout<<"       labour= "<<"$"<<labour<<endl;
  cout<<"total charges= "<<"$"<<charge<<endl;
  }
  if(code==2)
  {
  cost=280;
  rate=45;
  hour=3;
  labour=rate*hour;
  charge=labour+cost;
  cout<<"\ncost of electronic material=$280"<<endl;
  cout<<"assumption rate=$45 per hour"<<endl;
  cout<<"hours of work=3 hr"<<endl;
  cout<<"       labour="<<"$"<<labour<<endl;
  cout<<"total charges="<<"$"<<charge<<endl;
  }
  if(code==3)
  {
  cost=350;
  rate=45;
  hour=5;
  labour=rate*hour;
  charge=labour+cost;
  cout<<"\ncost of electronic material=$240"<<endl;
  cout<<"assumption rate=$45 per hour"<<endl;
  cout<<"hours of work=6 hr"<<endl;
  cout<<"       labour="<<"$"<<labour<<endl;
  cout<<"total charges="<<"$"<<charge<<endl;
  }
  if(code==4)
  {
  cost=310;
  rate=45;
  hour=4;
  labour=rate*hour;
  charge=labour+cost;
  cout<<"\ncost of electronic material=$240"<<endl;
  cout<<"assumption rate=$45 per hour"<<endl;
  cout<<"hours of work=6 hr"<<endl;
  cout<<"       labour= "<<"$"<<labour<<endl;
  cout<<"total charges= "<<"$"<<charge<<endl;
  }
  }
else
  {
  cout<<"\ntara mou hay kuj lan aala."<<endl;
  }
  system("pause");
}