Switch_Case_Grade

#include<stdio.h>
#include<conio.h>
int main()
{
    int marks;
    printf("Enter Your Marks :");
    scanf("%d",&marks);
    switch(marks/10){
        case 1:
        case 2:
        case 3:
        case 4:
        case 5:
        printf("You Are fail !\n");
        break;
        case 6:
        printf("Your grade Is : D");
        break;
        case 7:
            printf(" And Your Grade Is : C");
        break;
        case 8:
            printf(" And Your Grade Is : B");
        break;
        case 10:
        case 9:
            printf(" And Your Grade Is : A");
        break;

        default:
        printf("You Enter Invalid Marks !");
    };
    getch();
    return 0;
}