Finding grade using swith statement , finding grade in school program

Here is a simple program to find your school grade by entering your marks using switch statement in c++ , A simple c++ program to find grade using cpp switch statement

#include"iostream.h"
#include"conio.h"

void main()
{
clrscr();
int marks,x;
char grade;
cout<<"Enter your marks :: \n"; // marks should be out of 100

x=marks/10;

switch(marks)
{
case 9:
{
grade='a';
break;
}


case 8:
{
grade='b';
break;
}


case 7:
{
grade='c';
break;
}


case 6:
{
grade='d';
break;
}


case 5:
{
grade='e';
break;
}

default:
{
grade='f';
break;
}

}


cout<<"Your grade is :: "<
getch();
}