Program to allot Grade to students on the basis of their percentage

#include<iostream.h>
#include<conio.h>
void main()
{
clrscr();
int hindi,english,maths,total,percent;
cout<<"enter hindi marks ";
cin>>hindi;
cout<<"enter english marks ";
cin>>english;
cout<<"enter maths marks ";
cin>>maths;
total= hindi + english + maths;
cout<<"total is "<<total<<endl;
percent = total/3;       /*switch case can not be used for conditions*/
if(percent >= 90 && percent <=100)
  {    cout<<"Excellent ";  }
else if(percent >= 80 && percent <= 89)
    {cout<<"A+ ";                }
else if(percent >= 70 && percent <= 79)
    {cout<<"A ";  }
else if(percent >= 60 && percent <= 69)
  {    cout<<"B+ ";                }
else if(percent >= 50 && percent <= 59)
    {cout<<"B ";  }
else if(percent >= 40 && percent <= 49)
  {    cout<<"C ";    }
else if(percent >= 0 && percent <= 39)
    {cout<<"F "; }
getch();
}