Program in C to enter records

Write a program to enter records and also repeat the step if user wants to continue

#include <stdio.h>

void main ()

{

            char nm [20],cls[10];

            int rollno,m1,m2,m3,tm;

            float per;

            char ch;

            clrscr ();

            do

            {

                        printf ("\nEnter Marks of Hindi: ");

                        scanf ("%d",&m1);

                        printf ("Enter Marks of Pbi : ");

                        scanf ("%d",&m2);

                        printf ("Enter Marks of Math : ");

                        scanf ("%d",&m3);

                        tm=m1+m2+m3;

                        per=(tm*100)/300;

                        printf ("\nTotal Marks are %d",tm);

                        printf ("\nPercentage is %.2f",per);

                        printf ("\nDo you want to continue Y/N: ");

                        fflush(stdin);

                        scanf ("%c",&ch);

            }

            while (ch=='y' || ch=='Y');

            getch ();

}